FoxRiver Jr. Kids Buck Boot Sock 55% Acrylic/ 34% Wool/ 10% Nylon/ 1% Spandex Made in US Thermolite Polyester is a lightweight fiber providing breathability & warmth while moving moisture away from the foot. Thermolite combines a thermally efficient polymer and a micro-tested hollow core that heats quickly & retains warmth Our exclusive WickDry technology quickly draws moisture away from your skin so your feet stay dry and comfortable. Removing the moisture build up reduces hot spots and friction that causes blisters Heel and toe are reinforced with nylon to add durability and longer sock life Smooth, flat toe seam doesn't rub or irritate during wear. Plus, our smooth, flat toe closure technique adds durability so it stretches every way you do without unraveling Lightweight jersey knitting at instep helps eliminate bunching and bulk at the ankle