RunDry® Pro wicks away moisture to keep your feet feeling freshEngineered heel lock offers a unique arch support system providing a secure and stable fitAirmesh venting made of breathable mesh panels for enhanced airflowSeamless toe helps prevent irritationMade with Repreve®, a recycled plastic fiber with a focus on sustainabilityFabric: 57% Polyester, 30% Repreve Polyester, 8% Sorbtek, 3% Nylon, 2% Spandex|Small: Men’s 4-6, Women’s 5-7Medium: Men’s 6-9, Women’s 7-10Large: Men’s 9-12, Women’s 10-13X-Large: Men’s 12-15