The Cressi 7mm Sarago socks can be used with either full foot pocket or open heel. The smooth skin neoprene on the ankle allows maximum adherence between the sock and the leg of the wetsuit, reducing the passage of water. They are made of soft highly elastic nylon-lined neoprene. They prevent heat loss and keep feet warm. The sole is entirely non-slip. The construction of the blind stitch seam further improves comfort and aesthetics.