Celebrating their 25th year, Smartwool brings the PhD Ski Ultra-Light 25th Anniversary Print sock is designed for a perfect fit with a performance ski boot. The Indestructawool Technology adds more durability, with the 4 Degree Elite Fit System bringing a performance-oriented fit with a flex zone at the ankles. It comes with light cushioning in the shin, with a non-cushioned heel and toe for enhanced comfort while the Shred Shield Technology reduces wear in the toes. Included with these technologies is a 360 degree printing process to infuse the socks with pictures of mountains. Sock Height: Over the Calf, Body-Mapped Mesh Zones, Virtually Seamless Toe, 360 Degree Print Technology, 4 Degree Elite Fit System, Indestructawool, Multi-Density Cushion, Shred Shield, 52% Merino Wool, 42% Nylon, 4% Elastane, 2% Polyester, Warranty: Lifetime, Material: Wool/Synthetic Blend, Type: Ski, Weight: Ultra Light, Model Year: 2020, Product ID: 575296, Model Number: SW001045150-M, GTIN: 0192363633152