1.5mm neoprene upper and instep.nSmoothskin ankle cuff keeps sand and dirt out.nUses: Stand up paddle, surfing, kayaking, canoeing, windsurfing, jetskiing, boating, beach walking, parasailing, fin socks, snorkeling, lake-river-beach walking, sailboarding, pool, sand, swimming, surfing, yoga, shower, etc.nVented sole allows water to drain.nTatex outsole provides outstanding grip in wet or dry conditions.nThese boots feature vented soles that allow the water to drain from the boot, and tatex along the sole to provide more grip in slippery conditions