Hot Chillys Men's Micro Elite Boot Tech Tights (Can) 89% Polyester, 11% Spandex Made in the USA or Imported Knee-length cut gives your socks and boots more room to breathe Midweight, Moisture-Wicking Fabric (Moisture Transfer Fibers) Ultraviolet Protection Factor 30+ Bio-Silver Anti-Microbial Odor Blocking Properties The Chamois fabric has a lightly brushed interior for a soft, fleecy next-to-skin feel