Copper Ion fibers incorporated in the sock provides exceptional properties. Stabilizing ankle wrap reduces ankle strain and turn. Mid Foot compression and arch wrap support the plantar fascia tendon. Triple-Zone graduated compression for increased circulation in the leg. Exclusive Thor-Wick COOL fibers moves moisture quickly away from the foot. Features Thorlo thin cushion in the heel and forefoot. Designed for the unique stresses to carriers who spend time sitting, walking, lifting, standing, and moving up and down stairs. Machine Wash. No Closure closure. Made in the USA. 43% Nylon, 23% Copper Infused Polyester, 12% Copper Polyester, 11% Polyester, 11% Elastic.