Thorlos Men's / Women's Thick Cushion Tennis Crew Socks 88% acrylic, 10% stretch nylon, 2% spandex Thorlon acrylic fibers maintain softness and resilience for comfort, blister protection and durability. Thick cushioning in the ball of foot and heel provides maximum shock absorption. Extended cushioning over the toes protects feet during fast stops and starts. 87% Thorlon acrylic, 11% nylon, 2% spandex. Made in USA. Care: Machine wash inside out in lukewarm water. Tumble dry low. Fabric softener recommended.