Merino wool - 100% biodegradable

Wool fibres are 100% biodegradable. When a wool product reaches its end-of-life and is disposed of, the wool fibre readily decomposes in soil, slowly releasing valuable nutrients and carbon back into the earth, acting like a fertiliser. Because wool fibres biodegrade, science also shows that wool does not contribute to microplastic pollution in our oceans or land.
Learn more: www.woolmark.com/environment/

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One year, while herding sheep, I put my wool sweater on the ground (I was chasing the herd to keep them from going into a subdivision and eating all the flowers) . I went back 2-weeks later to pick it up, and the bugs had nearly completely eaten it (along with the weather) and there was about two handfuls of it left. Try that with an acrylic sweater.