Zoot Endurance Cycle Socks Zoned knitting technology creates ribcage of micro-denier acrylic terry around key areas of the foot, alleviating exterior pressure caused by the buckles and straps found in cycling shoes. 4" (10 cm) Double knit cuff construction ensures a snug fit at the ankle. Asymmetrical knitting construction creates right and left specific socks with additional padding under the metatarsal pads Nano toe seam construction 75% Micro denier Acrylic, 15% Nylon, 10% Spandex