Thorlos Men's/Women's Thick Cushion Casual with Thorlon Crew Socks 3% spandex Thorlon acrylic fibers are specially spun to maintain both softness and resilience, while wicking away moisture. Thick cushioning in the ball of foot and heel reduces shock and impact, while helping to prevent blisters. Low-profile toe seam minimizes rubbing and irritation. 68% Thorlon acrylic, 23% nylon, 6% polyester, 3% spandex. Made in USA. Care: Machine wash in warm water, inside out. Tumble dry low heat. No bleach.