Thorlos Experia Unisex XCXU Multi-Sport Thin Padded Crew Sock 74% Thor-Wick COOL Polyester, 14% Polyester, 10% Nylon, 2% Elastic Care Instructions: For longest product life and maximum comfort, wash and dry inside out (to fluff up the padding) using liquid fabric softener after each use (to condition the fibers for longer life) Padding Level: Sculpted Thin Cushion Runners World Gear Award Winnercalled the best of both worlds Guarantee - Your feet will feel better or your money back! Proudly MADE in the USA | North Carolina Ultra-lightweight sock frame made of Lycra mesh provides contoured aerodynamic glove-like fit and maximum breathability Powered by specially sculpted Thorlos pads in the ball and heel provide protection from friction, the primary cause of blisters, and impact protection where needed most. Foot Protection = Foot Comfort Achilles-tendon pad protects the heel from rubbing/chaffing/blistering, while also functioning as a heel lock, assuring your sock wont slip down into your shoe Rib-knit cuff