EXPERIA is a Runner’s World award-winning, high-performance, multi-sport sock powered by Thorlos pads. It’s a perfect choice for running, cycling, light hiking, tennis, fitness training or walking. It is made with Thorlos’ exclusive thin cushion padding which matches the foot's natural ball and heel pattern resulting in incredible comfort w/o the bulk of other padded socks. Thorlos Brand Promise Guarantee - Your feet will feel better or your money back! Made in the USA. Thorlos: Better feet. Better Life. 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 won’t slip down into your shoe Rib-knit cuff