The majority of every Revert sock is organic cotton — no pesticides, no chemical treatments, nothing that harms the skin wearing it or the soil it eventually returns to. Cotton fibers that shed biodegrade. They don't persist.

Every sock needs a small amount of synthetic fiber for stretch and recovery. Most brands use conventional nylon — it sheds microplastics that persist for hundreds of years. We use a biodegradable nylon engineered to behave like a natural fiber once it leaves the sock. When shed fibers reach the environment, microbes break them down completely — in under 4 years, not centuries. In independent seawater testing over 1,362 days, our nylon biodegraded 94%. Conventional nylon: less than 4%. No microplastics remained.

The science is clear — high-twist, multi-ply yarn construction traps fibers more firmly. Less shedding during washing. Every Revert sock is built with 2 and 3-ply high-twist yarns specifically for this reason. And when fibers do shed, they biodegrade. The same construction that reduces shedding also delivers 11,159 abrasion cycles before breakdown — more than twice the industry standard of 5,000.

What your socks are made of outlives the socks themselves. Choose accordingly.