The PhD Ski Light helps keep your feet warm and dry even on the longest days. We placed cushioning where skiers need it most: on the shin to banish shin bang and on the bottom of the foot for warmth and impact protection. Patent-pending Indestructawool technology provides ultimate durability to make sure your socks are ready to go, run after run. Made with our 4 Degree elite fit system for a sock that doesn't bunch, slip, or bind.<br><br><b>PhD:</b> Built for Performance in the Highest Degree<br><br><b>4 Degree? Elite Fit System:</b> Uses two elastics for greater stretch and recovery to keep the sock in place<br><br><b>Indestructawool:</b> Indestructawool technology features a patent-pending construction method for exceptional durability and comfort<br><br><b>Mesh Venting:</b> Men's-specific mesh ventilation zones provide additional breathability and moisture management<br><br><b>Light Cushion:</b> Light cushioned shin and sole for impact absorption and warmth<br><br>Care Instructions: Machine Wash Warm Gentle Cycle. Do Not Bleach. Tumble Dry Low. Do Not Iron. Do Not Dry Clean.