NIKE Strike Mercurial Soccer Dri-FIT fabric helps keep feet dry and comfortable. Zonal cushioning helps relieve cleat pressure. Heel lock system helps keep the sock in place. Increased cotton count provides more traction, inside and out. Dynamic arch compression offers support and lockdown. Flex grooves are knit into the footbed to give you a more natural feel. Left/right specific. Graphics on the calf are inspired by the Mercurial soccer cleat. Fabric: Dri-FIT 46% nylon/43% polyester/6% cotton/5% spandex.