Smartwool PhD Ski Graduated Compression Ultra Light Strategically placed mesh ventilation zones provide ventilation for temperature and moisture management Sock Height: Over the Calf, 14" overall height, Virtually seamless toe 20-30 mmHg graduated compression rating-Style: SW0SW001 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-Non-cushioned sole and leg for a close fit in tight-fitting performance boots; graduated compression to reduce fatigue and speed recovery.