made of 2.0mm warm, lightweight, stretchable neoprene, good fit with most boots.Dot printing on bottom ... YKSK004Description 2.0MM flat-lock neoprene socks for beach &surfingMaterial Neoprene, NylonSize S, M, L, XLFeatureMade of warm, lightweight,stretchable, highly water ... resistant of 2.0mm neoprene. Good fit with most boots. Wear ...