The Smartwool Ski Zero Cushion Over The Calf Sock is a slim fit sock for skiing. The non-cushioned sock features a soft blend of merino wool, nylon, recycled nylon, and elastane. The fabric is designed to regulate temperature, breathe comfortably, and thanks to Indestructawool technology, remain durable throughout the season. Enjoy a close fit inside the ski boot, with a comfy, 4 Degree elite fit system that stays put.