Thorlos Experia Unisex XEOU Multi-Sport Thin Padded Compression Over the Calf Sock 43% Nylon, 23% Thor-Wick COOL Copper Infused Polyester, 12% Copper Polyester, 11% Polyester, 11% Elastic Made in US No Closure closure Turn Inside Out-Machine Wash-Use Liquid Fabric Softner Key benefits: perform stronger. Recover faster. Designed for multi-sport use: running; cycling; training and fitness walking padding level: sculpted thin cushion Feature #1: compression and stabilization mid foot compression and arch wrap supports the plantar fascia tendon Feature #2: heel and achilles padding protects the achilles tendon by eliminating rubbing and chafing while also functioning as a heel lock to prevent slipping into your footwear Feature #3: thor wickcool moves moisture quickly away from your foot to the outside of your sock allowing moisture to evaporate; keeping your foot noticeably drier; cooler and more comfortable Feature #4: ventilated toe box provides maximum breathability keeping your foot cool and comfortable