The weatherproof benefits of shoe covers without the excess bulk. A 2-layer membrane solution similar to shell gloves engineered to add a waterproof insulating layer between your base socks & your shoes. Developed as a protective layer between base socks & shoes for added protection. Being worn inside the shoe removes the risk of crankarm & chainstay rub that shoe covers can cause. The Thermo Rain Socks extend above our standard sock cuff height ensuring your liner socks stay dry. 90%PA 10%EA