SmartWool PhD Ski Graduated Compression Light Socks - Past Season 51% Merino Wool, 40% Nylon, 9% Elastane Built for Performance in the Highest Degree, Uses two elastics for greater stretch and recovery to keep the sock in place, Patented ReliaWool technology in high impact areas provides superior durability, Light cushioned shin and sole for impact absorption and warmth; graduated compression to reduce fatigue and speed recovery. Strategically placed mesh ventilation zones provide ventilation for temperature and moisture management 20-30 mmHg graduated compression rating ock Height: Over the Calf, 14" overall height, Virtually seamless toe Style: SW0SW002