Desert Military Boot Sock is a low volume sock engineered specifically for hot to moderate climates. Acrylic & Wool blend wicks moisture keeping feet dry & cool. Silver Lining™ battles bacteria helping eliminate foot odor & also aids in prevention of blisters. Go Covert.Contents: 44% Wicking Acrylic / 28% Wool / 19% Nylon / 2 % Polyester / 5% Lycra® Spandex/ 2% Silver Lining®Construction:Silver Lining® in Heel & Toe helps prevent Infections & fights Foot FungusAbsorbent Acrylic helps keep feet dry all dayStay Up Top w/ hugging support all dayThick Wool Cushion heel pad and toe for relief of High ImpactSpecial wool fights friction & hot spots helping prevent blistersBuilt - In Arch Support made for the long haul, special "Y" heel for better fit to the contour of the footInstep Flexzone to prevent bunching of the sock.