Smartwool PhD Ski Medium Pattern, Bright Blue, Medium 33% nylon 65% Merino Wool, 33% Nylon, 2% Elastane 14" overall height Sock Height: Over the Calf Flat knit durable toe seam 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, Men's-specific mesh ventilation zones provide additional breathability and moisture management, Medium cushioned shin and foot for impact absorption and warmth.