Merino wool is blended with Acrylic-Pillex face yarn for a high-performing outer that's insulating, moisture wicking, and pill-resistant. And the nylon/spandex lining is soft yet durable and abrasion-resistant. Designed for an ideal fit, the Summit features cushioning, compression, and reinforcement zones throughout, and thinner materials on top of the foot and around the ankle to help with ventilation and preventing blisters. This sock is great for a full day of resort skiing and boarding, with plenty of softness, comfort, and premium cushioning. Details: 36% Merino wool, 36% acrylic, 26% nylon and 2% spandex blend, blended face yarn for insulation and wicking with abrasion resistance, blended lining yarn for comfort, abrasion resistance and strength, reinforced heel, toe, and extended foot zones for durability, instep, ankle, and upper cuff compression zones, medium cushioning in foot bed, and upper. Material: Merino Wool, Acrylic, Nylon, Spandex.