What You Wear Outdoors Can Affect Your Exposure to UV and NIR Light
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- Опубликовано: 23 дек 2023
- Roger Seheult, MD of MedCram explains how the types of clothing you wear outdoors can affect the amount of UV and NIR light your body will be exposed to. See all Dr. Seheult's videos at: www.medcram.com/
(This video was recorded on December 23rd, 2023)
Roger Seheult, MD is the co-founder and lead professor at www.medcram.com/
He is Board Certified in Internal Medicine, Pulmonary Disease, Critical Care, and Sleep Medicine and an Associate Professor at the University of California, Riverside School of Medicine.
LINKS / REFERENCES:
Melatonin and the Optics of the Human Body (Melatonin Research) | www.melatonin-research.net/in...
Near Infrared Transmission through Various Clothing Fabrics (Journal of Textile Science & Engineering) | www.hilarispublisher.com/open...
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Video Produced by Kyle Allred
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#NIR #infrared #UV
![What is Infrared Radiation & Electromagnetic Spectrum? - [4]](/img/1.gif)
Thank you, Dr. Seheult, for your ongoing emphasis on the benefits of Light as Medicine and the best techniques by which to expose yourself to sunlight.
Dr John Ott - Health & Light
@@my_channel_44YES! I found him in Sarasota, Florida, in the early'90's.
Great video. Now I know why double denim is a fashion crime.
You have my complete attention with this NIR series. First you showed very convincingly how important NIR is to our bodies, and now many of the factors in actually getting it outdoors. When the weather warms up (it is still snow season here in the Arizona mountains) I will definitely make tee shirts my choice for hiking while using sunscreen on my arms and face.
As the father of a "moderately severe" asthmatic (three months in patient status in National Jewish Hospital to break his prednisone dependence have given him a future, but it looks unlikely he will outlive us) I have seen immune responses as the Next Big Frontier in medicine for 30 years, and here I'm seeing it happen! Such is medicine: major victories are not recognized until changes are widely adopted and real world numbers become big news.
If you can put together information as comprehensive as this for artificial sources (e.g. heat lamps and NIR LEDs) I will jump on it as quickly as I did this video.
Anyway, *thank you* for this series. You don't have to see us as patients to make these real changes in our lives.
Thank you so much. Plenty of sunshine can also help asthma.
www.timesofisrael.com/plenty-of-sunshine-could-help-against-asthma-israeli-study-shows/
They are looking into vaccines for autoimmune disorders. Fingers crossed that they develop one for asthma.
@@shakeyj4523 ?what did you learn from the most recent debacle?! A practicioner of Chinese medicine may have some very interesting help for you, if you're willing to do more than eat a pill.
@@sueyoung2115 Yeah, no. I will stick with science and not some grifter who will tell you to smear sloth spit on your cheerios.
Carnivore diet has resulted in resolution of a number of immune disorders including rheumatoid arthritis (M Petersen's RA from childhood), eczema, psoriasis, ulcerative colitis, and perhaps more. I haven't heard of asthma resolution but worthwhile researching and trying.
Thanks doc, wish more people would talk about this. Continue to where my wide brim hat when taking a sun walk during the months of high intensity. No head burns. 👍
Excellent advice! Covering up but getting outside is the best!
Huge gratitude to you for posting such a mass of research condensed into a video understandable by non medically trained people. This subject is one of my particular interest; I guess it's an idea whose time has come to the fore! As i scroll through the comments, it's obvious from the questions asked, that lots of people don't bother to check out the linked references. "You can lead a horse to water but you can't make it drink".
I just want to point out one thing. Around 10:30 you point out that some colors absorb NIR while others don't. But I think it's important to note that this may be highly dye dependent, which may be why some of the colors have numbers (e.g. green 2). As an extreme example, the dye Blue #1 is completely transparent to NIR while copper salt solutions (e.g. cupric sulfate) absorb NIR light strongly. Admittedly, I'm not familiar with the presented study, but I'm just guessing that dyes used for fabrics may have their own variations.
Interesting point. Have you seen any materials on the user of methyline blue and NIR?
This ongoing advice has been shared with family, and we have been using near-IR lamps for two months as sunny days are limited from October to March here in Scotland.
Hi, I have been searching for nir lamp online, but haven’t found one that produces light in the NIR spectrum, may I ask where you found yours? Thank you
@@UraniaOfTheGalaxy I bought mine from Amazon UK but is no longer available. However Boots sell the Bodi-Tek Infrared Heat Lamp for around £40, and this includes the spectrum from 1200-1400 nm. I got this for my elderly parents 6 months ago and they seem to have benefitted from it.
Thank you!@@briangriffiths114
Some of this was kind of rushed, can you do another video on it, please? For example, what time to go outside and the fabrics was kind of raced through. I really appreciate these helpful videos!
I love this information!
But this channel bring the good and useful info forward to the people always.
Thank you, Dr!
Merry Christmas!
Seriously though. I am not by any means in the medical field. But I have learned so much and actually had your videos effect my life and my family's. I'm just a nerd who paints cars for a living. But videos like this intrigue me.
I just love to hear this. This information is for everyone !!!
I’ve been tempted to buy a UV transparent shirt also called “tan through”. I understand that UV can increase skin cancer but skin cancer is extremely treatable as long as you notice it early. I believe sunlight is a net positive but I never considered all the benefits might come from infrared.
Melanomas also develop in areas that receive little or no sunlight. Ponder that for a while...
The majority of damage occurs during the middle of the day, when the sun is highest in the sky. That's also when Vitamin D is produced. It's best to get some morning/evening sun exposure so the body produces the exceptionally powerful antioxidant melatonin, in addition to midday exposure for Vitamin D.
Nurse, your descendants will thank you. We need to be used to being outside often as our ancestors did…they didn’t have the skin cancer rates we do because we got too indoorsy and lost the mechanisms that kept us healthy in the sun.
👍
@@ruidadgmailcanada8508 we started consuming vegetable oils and then used up our glutathione. The resulting attempt by the body to contain the oxidative damage is what we call cancer...
I wonder if the denim they tested was pure cotton? I know a lot of modern "denim" has more stretchy synthetic fibers woven in. Also, in far northern areas, you might get sunlight but less NIR because of how low the sun is on the horizon or when it's behind mountains.
Good question. I wear the stretchy kind of jeans.
I have some experience with NIR in plants. NIR bounces off the green leaves of plants, which allows it to penetrate deep. Each leaf that is exposed to NIR will absorb a little bit of NIR. If you are under a dense canopy, there won't be much NIR left, but when there is just enough to block direct sunlight, you will still receive significant amounts of NIR. Also, under an umbrella, in a field of grass, you will receive plenty of NIR bouncing off the grass.
💯
And I’m guessing you will avoid the UV - can this be confirmed - that is to say, is this understanding correct or the reasoning is sound?
@@matth6299 Yes, plants absorb a much larger share of UV light than NIR. UV light can be used for photosynthesis, with the excess energy being converted to heat. So UV light will be absorbed and not reflected. NIR has less energy than the red and blue light that plants use, so it cannot be converted. They have limited use for NIR light (but it is still crucial for growth). Excess NIR light is therefore reflected out again.
VERY helpful. Thank you. I am still going to use my Hooga (red and nir light device) in the winter while days are short and layers are many. but I will definitely revisit this in the spring and dress accordingly
At 10:41 you pointed out that blue will allow NIR to pass through relatively well. Please note that the line you pointed to was the WET BLUE line. The Dry Blue line was the nearest rival to Green for blocking NIR (at 5 to 6 layers). Thank you for sharing this fascinating information in this, as well as so many other videos.
What does that mean?
@@shakeyj4523it may help you with comprehending this intense material if you put your UTube setting for video speed down .
At .75, it won't go so fast and you can watch it a couple of times to " get it " all. Then you can go to the linked research papers and scroll down till you get to the information you want to learn about.
I would have never given this much thought to how much & what kind sunlight affects us. Very insightful. Thank you!
So do you think the use of Radiant or Infrared heaters would be beneficial to your health?
Thanks for the video!
Could you please advise how to compensate for the lack of NIR in winter in North region? Are there some special devices?
Get outside more often the best way. Lamps could work but you need a broad range of wavelengths.
@@Medcram thank you for the response. I'd like to hear your opinion about the light therapy glasses (Luminette, AYO etc.). They are around for a while, but there is not enough information whether they're safe and effective for dealing with winter blues or insomnia.
A great follow up to your previous info on light & health
Thanks Dr. Seheult, I've followed you since 2020 and gotten IR light being outside almost every morning and take a daily evening walk in green spaces and I have yet to get a serious respiratory infection. I also take D3. The two combined have been fantastic for my health. You're a gift!
Great video as always!
YOU ARE AMAZING ! MY WORDS WOULD NOT TRULLY EXPRESS MY GRATITUDE FOR ALL YOUR HARD WORK YOU HAVE DONE ❤… THANK YOU FOR SHARING WITH US ! YOU ARE SAVING LIVES .
You are so welcome
Merry Christmas Dr Seheult and Kyle.
Thank you the thoughtful videos you produce throughout the entire year.
PS The lightbulb graph you linked was intriguing. Unless it showed and incandescent bulb can produce a higher fraction of NIR than the sun! Of course the sun is likely brighter, but still interesting.
Do you think an infrared sauna gives you maximal benefits of both sauna and NIR?
People used to sit in front of the fire!
Yes. Just wish we had more data.
Super helpful!
Thanks from Brazil. Merry Christmas
Thanks for the info, doc! Fascinating stuff! Happy holidays to y'all at medcram!
Thank you! You too and here’s to great health and knowledge in the New Year.
Good to know, and for a part I could indeed feel the heat coming in different with different kind of clothes. The part of the reflecting green is also to be felt in nature, comfortably cool under the threes is always the best place 👍
Very interesting series Doc! Happy Holidays to you & your family! Be well & stay safe! 👍👍🌲🌲
Thank you, useful info for UV sensitive. Happy hols.
Thank you for this ongoing series on bioluminescence. As an N of 1 it is completely anecdotal but I am trying to increase my exposure to NIR. I have several autoimmune conditions which leave me chronically fatigued. I am on multiple medications and I have tried to increase activity levels. And although many of my symptoms improve for intervals, it takes only a small stressor (e.g.,URI, vaccine) to throw off the balance and symptoms worsen. I have started to try to add outdoor time daily no matter how I feel. I'll continue to follow your information on the topic.
One of the best things that helped me with post exertional malaise was to supplement with Boron. A buddy has fibromyalgia and I have ME/CFS and we both rarely experience PEM anymore since starting Boron.
I'm not sure if that's an issue you're dealing with, but if it is, I hope it helps!
@@Eyes0penNoFearWhat is your dosing of boron, and your weight? (110 lbs here)
Merry Christmas/Happy Holidays Doc.
Awesome...Informative and clear...Usable info
Yay! More very helpful light as medicine content!
Years ago I saw a report that said the silk is best to filter UV light.
Fascinating video thank you very much
Clothes in Australia have used a Sun Protection Factor rating for UV, just like sunscreen, for at least 25+ years.
Yes I have been sunburnt through clothes before they started rating them, and yes I got burnt more through wet clothes .
Our sunscreen factors also go up to SPF 50+
Winter in Canada is a time when hours of sunshine are very short and clothes are thick and bulky. It’s also the time when we get sick the most often. How well does NIR penetrate a parka, or a down jacket with the hood up? I suspect that research hasn’t been done. It would be useful for northern latitudes to have practical NIR strategies for the dark, cold season.
Very good, very clear, once again.
You have certainly helped me understand how privileged I am to live in Brazil, and how to get maximum benefit from the wonderful sunshine we are blessed with.
I was not born here.
Very interesting, thank you!
Thank you for this. I'm in Canada where right now it's dark/grey/cold most of the time and going outside sucks. I'm developing a "sun" light for my own personal use with 850 nm infrared LEDs. But I'm himming and hawing over wether or not to include UVB. I got the LEDs that produce 310 nm. I've built a spectrometer to confim the wavelengths. I just don't know if I should include them or not. The body naturally produces Vitamin D from UVB so that makes me think that yes I should. What I can do is include UVB but at a low intensity, where it's as intense as the infra red. I'm also planning on this being the equivalent of 20 minutes of daylight but over the course of 4 hours by the light. The idea to keep it beside you while working, if you have an office desk. I made that decision to prevent over use of the light. Do you have any thoughts?
That’s a tough one. Maybe construct them with the ability to turn off UVB in case we learn more in the future.
@@Medcram that's a very good point. I will make sure to add that.
Hi! I'm in Canada too. I made a near-IR light array with 4x 150W IR incandescent light and it seems to work very well.
How did you build the spectrometer? - that’s something I’ve been thinking about for a while….
Having by the desk is a great idea thanks.
Thank you, Doctor! Merry Chirstmas!!
Thanks Dr S. Merry Xmas🙏🇨🇦
And to you as well. (Plus Boxing Day) 🇨🇦
Thank you! We love your content. Michelle works as a nurse and on her lunch breaks she takes any opportunity she can to get outside for some sun. Even on the top floor of the parking garage.
That is awesome!
Always informative. Would love to have seen a reference to the measured (or theorized) therapeutic effect of NIR for n exposure time. While im aware of photobiomodulation related publications in this space, I havent seen anything specific to natural sunlight exposure ( or other passive environmental exposure to NIR ).
I got a back and shoulders heating pad and chose one that had far infra red. It just seems that it penetrates deeper. It would be interesting to hear if there are any studies comparing the benefits of both types and if they overlap.
This is f*cking wonderful! I am at a hotel on Christmas Eve, was getting ready to wash my face etc which is when I normally have my “RUclips time” and literally *squealed* when I saw this video load at the top of my suggested list. I have been thinking about this very topic so much, seeking and not finding the answers to the questions I have, and it feels like serendipity and a custom Christmas miracle that you guys made this vid. My younger self wouldn’t recognize this girl getting positively GIDDY over something like this, but she’d be happy for her nonetheless haha.
Once again I am just so thankful to you for all that you do. I want to support you more than just liking every video you put out - but am just a medical hobbyist, not a professional - do you have any courses that would be friendly to someone w/o med school background? Or a Patreon?
Happy Holidays to both of you, what a blessing you are to this world.
Your vidoes are excellent. I'd love for you to do a video of any research done on diet. Specifically plant based diets and their effects on mitochondrial function and overall health/disease reversal. Just food for thought 😉
Thanks!
Carbon black has 60+ electrons that can become delocalised, so absorbes light over a wide range of frequencies. Black can achieved by mixing multiple dyes that are only active in the visable spectrum. I fear they would have a significant difference in IR striking the skin.
Do a video on ways to improve sleep and what type of lights to use at night to minimize blue light
subscribed! Thank you.
Welcome aboard!
We appreciate your insights. Happy Holidays.
I remember coming across some of this over 20 years ago when I heard about camcorders with night-mode being used to make "x-ray vision" cameras that could see through clothing.
That’s correct. It was based on infrared light.
After one of your first videos on NIR, I went looking for LED products and was surprised at how many are available, touted for skin care and repair. I found a cheap unit, about 12"x12" so no big loss if it's ineffective. Things it might be useful for is some idiopathic peripheral neuropathy, and, well, not much else. If I can get mitochrondria to burn off some excess sugar, that would be nice!
While understanding the risks, and somewhat minimizing them, I mounted it in my shower, it's plugged into a GFCI, and I have the power switch on the hot wire. It's fairly high, and water isn't splashing on it.
I can't point at anything that's improved, however I seem to spend more time in the shower, towel off in the tub by the light, etc.
As for clothing, it's pretty much as I expected, though it would be really nice to see absorption spectra of various dyes and fabric.
Awesome
More cool science, thanks!
Can you do a video on SAD lights against depression? Roger Seheult?
Best thing I've found is grow LED panels for day, daylight light for a few hours when waking up, and red/infrared LED panel for evening. They are sold as 'health panels' for about $35 on ebay.
Standard American Diet 😮
@@puntabachataSeasonal Affective Disorder..... depression and sadness in the winter from less sunlight and shorter days
Is there a recommended NIR bulb we can install indoor?
That has been my question since the beginning of this series. I would like to know the minimum required spectrum, is it 750? 850? I don’t want to waste money on a fancy light that has lofty claims but is not high enough on the NiR spectrum.
Thank you Dr Sehault for these great lectures
Light therapy has become part of my treatment arsenal for my patients
I have given you liferime membership to The Wellionaires Club 😊😊
Keep this research coming
Rgds Dr D O Flynn
I haven't watched yet, but I'm really hoping this video will help me convince my neighbors that skinny dipping in their pool is the most healthy option 😆
Not sure if you'll see this, but Medcram has been instrumental in educating me as UC provider during covid especially. I have helped a lot of people through your education. I worry for you, not to get down by internet trolls, even those with MD after their name. Maybe best to ignore them, and just keep doing your good work. I'll try to follow my own advice. God bless you and keep you.
Thank you. Truly appreciated.
@@Medcram Most welcome. Thank you for all you do (I'm also taking the Medcram CME, love the asthma and EKG ones, my son has asthma). We appreciate all you do. Keep up the strong work. Love how you're laying the foundation for the right arm. God bless you.
At 7:54 - am interesting "aside".
Most cell phone cameras (and maybe regular digital cameras) have additional IR filters inserted over the lenses, because people were afraid of being seen "in the nude", because of how NIR would penetrate, allowing the images of areolas/nipples, birth marks, public hair to be seen in pictures .
Dr., can you look at plexiglass/perspex as a UV block, with a hive window for visible into IR?
And, if of interest, consider twin pane plastic with a small layer of water in between, too dampen some of the sensible IR that is absorbed as heat in the skin.
When is your book coming out, Roger?
The points about light bulbs and windows is interesting. It's like a few other things I read; good for health vs food for bank account.
I thought of a few times I saw videos of history if what clothing was like back in the 1600s. Even in the summer they wore layers. We know men didn't wear shirts and ladies had to wear long dresses. Yet they only used cotton, noo synthetic materials. My impression is this another reminder of how things are complex in science. How UV is good and bad for example. Also would be a challenge to make changes reflecting colors and materials i.e. we no longer use certain materials or colors.
Nylon 66 is an infrared fabric
Tell me where I can get some anti covid lights for my inevitable infection. It is always overcast hear and snow cold keeps us inside. Love to buy one of those light vests they used in that study.
Thanks Dr. Seheult. Can you speak to far infrared light? Many products sold for the home uses far infrared.
That I’ll have to look into!
Hemp is great for NIR. Clothes must be labled for their UV blocking level. We only see UV -C around mid day. Just get a vit B shot.
This was a great video. Question- what effect does sunscreen products that are applied to the skin have on NIR penetration?
Shouldn’t have much. Can penetrate.
Most jeans, at least for women, are not made of denim any longer. They're made of a thin, stretchy cotton elasthan blend for a nice, comfortable fit. I think that goes for jeans jackets as well.
That’s a very good point.
Thank you! Great information. Just curious as to why the eye doctor keeps telling me to wear sunglasses and claims the sun will damage my eyes. Is it a certain wavelength like what you mentioned as the timing of exposing yourself to sunlight?
At 10:50 So green denim would be very effective. Mr. Green Jeans was ahead of his time. 😃
It would be interesting to control for what sun made wave has the most benefit for treating illness such as Cvd 19. I wonder if a portable machine that emits these rays like a joov, only thing is that is doesn’t emit uva-uva-b and other light colors other than red
So I need to start using my fireplace. Good. I never got my wood processed but good excuse to be out of the house.
We have cloudy skies here in New Zealand summers. Does solar infra red get reflected back from the upper surface of the clouds.?
Nowadays, red NIR lamps are popular for health improvement, isn't a better option for example a halogen bulb in an office desk lamp with corresponding power? The spectrum of these bulbs is much wider and mainly closer to the sun... and the price is a bargain
I’m internist and now, me and my entire family have Covid. I would like to add to the therapy some infrared light.There is almost not at all natural light these days. Could you recommend a company or a specific device?
How much do we know about the length of time that one should optimally be outside to absorb NIR? Is 15 or 20 minutes adequate or does a longer period of time provide a more benefits?
The doctor's recent video, "Patient Study: Using Sunlight as a part of COVID treatment" has details. Whether more time is better... I don't think I've seen anything about that.
So it sounds like NIR is latitude dependent similar to UV, but without the major drop off in the winter for the majority of the USA seen in UV.
What about clouds? Any good research about NIR penetration into clouds? I will say, the worst sunburn of my life was on a very overcast spring day.
Ah....................This explains....Everything that i was putting down to an overactive imagination. PPL, our electric company, gave me...yes..Gave me...LED Replacement bulbs for my e3ntire house..a Huge supply of them..and i have not felt well since replacing the bulbs...not only are they dimmer...they are indeed Not giving off the right lightwaves....so what i have been 'feeling'..increasingly as time passes, does indeed make Perfect sense.Thank You!
Oh wow. Realize too that led lights flicker at very fast rates that you may not notice but you brain does incandescent dies not.
Thank You!....this gives me not only an explanation why my seizures have mysteriously gotten worse..but a Medical Reason to get rid of them....gonna do that...Right Now. Thrifty, i saved the old bulbs, hidden away in a box. Just in case.
Again...Thank You & Blessings on You & Yours @@Medcram
Does a glowing fire of embers provide beneficial infrared?
Are modern windows blocking light that is important for human health? Also do LED lights produce a healthy light?
So NIR is actually strongest at mid-day?
Does anyone know what the y-axis units are for figure S8 in the Zimmerman paper "Comparison of NIR to Visible exposure levels from 1800 to Present"?
It's not explained in the full text (there's a link on his NIRA website, Our Mission page).
ruclips.net/video/mHchf6LD8Ro/видео.html
A question: Are be beneficial effects of NIR systemic or localized? I've started working out on an exercise bike with a incandescent heat lamp warming my bare back. Will that help all over or should I also get some of that NIR onto my chest?
Incandescent has NIR. I’d bite to do it outside! Also nir lamps are usually limited in wavelength. No so with sunlight or incandescent.
How about just using Heatlamps?
What about the risks such as increased likelihood of developing cataracts?
Wear your sunglasses and expose the rest of your body as he suggested. Not that difficult to figure this out.
have they tested penetration of down jackets?
What about the light from a wood fire? It feels so good to get exposed to it, could there be health benefits to it?
I've wondered about why humans like campfires so much and just how much IR is hitting our eyes as we watch the dancing flames. Yeah, I'd it's plausible that there are benefits beyond warding off a chilly night. It also makes me wonder how important the opaque goggles are that come with a lot of Red/NIR lamps.
Yes. Good supply of NIR
Fantastic, perhaps that is why wood fired sauna gives more satisfaction than an electric.@@Medcram
From morocco, thanks
Our pleasure!
I cannot find any information about far infrared.
I have a infrared sauna I use at home. Are these NIR?
Some use near infrared, some use far infrared. You'll need to check with the manufacturer
Question: do you need direct sunlight for the NIR exposure? Or can you get the same benefit being outside but in the shade? (Not in the shade of a forest but of a building)
You don’t need direct sunlight. You can get incident NIR especially if surrounded by living green plants/grass.
Thank you for the reply 😊
👏👏
I am lost . Can someone please , to summarize me , when it's good to go out ? I understand that I should not wear denim ..and cotton polyester combo is good. Thank you in advance to whom will help me with an answer. 🤗
Earth's atmosphere filters out UV rays when the sun is lower than a 45° angle. The easiest way to gauge this is to look at your shadow. If your shadow is longer than you are tall then you're receiving very little UV.
Unless you live in the tropics, in the winter time it doesn't matter when you go outside because your shadow is longer than you are tall so you're getting good infrared and very little or no UV.
UV is still important because it causes the body to turn cholesterol into Vitamin D.
The most healthy sun exposure in the summer is to get plenty of sun in the morning and evening, and limited sun exposure (20-60 minutes, depending on your latitude and skin color) in the afternoon when the sun is highest and your shadow is shorter than you are tall.
@@Eyes0penNoFear thank you very much..
@@Lolipop59 happy to help!
Hello 1:04- 1:10 it is not scientifically accurate and, I say wrong to call UVA, and UVB radiation as "ionization radiation" it is NON- ionizing radiation. This goes back to board questions we get in Step 1 and onward to board exams in Radiology and Radiation Oncology. UV is non ionizing radiation they create thymidine dimers and are considered ionizing like X-rays or Gamma rays.
衣服面料对近红外光的穿透性：
衣服布料层数越少，近红外光越能穿透到达身体。
cotton / polyester(棉/涤纶)对近红外光的穿透性最好。
牛仔面料（Denim）与棉毛巾面料的穿透性最差。
衣服颜色对近红外光的穿透性：
绿色最差。其他颜色都差不多。
白色的涤纶（黑色稍差一点点）较好。
棉面料，除了绿色以外的，都差不多。
总结：选多孔的cotton / polyester(棉/涤纶)面料的，层数较少的，除绿色以外的衣服。可以保证近红外光穿透到达身体。
考虑到健康性（棉是天然的，涤纶是用石油化学合成的），选棉的更好。
避免：牛仔面料（Denim），厚的面料，与绿色面料。
So, do I understand that the so-called benefits of NIR are speculative?