We can't tell you that if you were to throw these in your compost bin when they've reached their end of life, that they'll likely disappear with your compost over not that long, but that's what testing from our yarn suppliers at Rhodia will tell you about their Amni Soul Eco yarn. Fact is, this stuff is so advanced, it's pioneering and there aren't standards to test biodegradability - yet. This incredibly soft, lightly padded sock represents our commitment to pushing the limit of what's possible for sustainability -- to the point where we can't tell you it's biodegradeable, at least until there's a standard to measure it. In the meantime, the Signature Eco sock not only represents an evolution in yarn technology, it's also an evolution in our best selling Signature Sock - ultralight weight, compressive, breathable, super soft and lightly padded. Socks are sold as FINAL SALE. They cannot be returned or exchanged.