"Medium-density padding under ball and heel provides extra cushioning and protection from painful blisters. Low-density padding along top of foot and shin protects against abrasion caused by lace pressure and boot folds. Flat knit ventilation panel enhances wicking action of CoolMax?* and Foot*Health? acrylic. Low-density padding with spandex around the arch and instep prevents bunching, allows boot to snug closer, and supports arch better. Content:52% CoolMax?*, 26% acrylic, 14% stretch nylon, 5% spandex, 3% cotton"