This sock was designed for ultimate functionality. We worked with boot fitters to create a sock to aid in fitting ski boots. The Boot Fitter sock is made with high-content merino for temperature regulation, nylon for durability, and nano glide for ease of entry into the boot. Hit the slopes with this functional and technical-looking sock. Anatomically Designed & Knit Memory-Knit Construction Moisture Wicking Arch Support Reinforced Heel / Toe Comfort Toe Seam 46% Merino Wool, 44% Nylon, 5% Nanoglide® Nylon, 3% Spandex, 2% Polyester Style #5010