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.