Compression-fit, no-show performance running sock encapsulates silver ions in the yarn to keep feet clean and dry Drynamix polyester blend features fibers and knit patterns of varying tension to provide compression and support without constricting movement Constructed to mimic running shoe design, the silver sock locks in the heel and mid-foot, while allowing the toes to move freely Seamless toe box minimizes friction for blisters and chafing; high tab heel and extra deep heel pocket keeps socks from slipping down Medium-volume cushioning ensures comfort and durability for extended training and endurance events