If you're looking for a sock that's super-thin and extra-breathable, then look no further! Bolstered with Feetures' unique CoolFeet ventilation system, the High Performance Ultra Light No-Show Sock helps runners and cyclists keep their cool when the action heats up. It's no wonder they're the choice of serious competitors! Thin, flat-knit construction takes up minimal room in the shoe for added fit, while the Perfect Toe eliminates irritating toe seams for long-wearing comfort. Lightweight mesh encircles the entire foot in two places for maximum ventilation and breathability. SnugFit technology adds extra support, minimizing foot movement to prevent blisters. The No-Show Tab hits below the ankle so there's no tan line, while Y-heel construction keeps the sock from sliding into the shoe. High-tech iWick fibers wick away moisture to keep feet cool, dry, and odor-free. The High Performance Ultra Light No-Show Sock is made from a durable 84% iWick polyester, 13% nylon, 2% Lycra spandex fabric blend. Imported.