5 mm high stretch Neoprene. Water-proof seams and no zips make for the ideal sailor, jet-skier, paddler or Diver using soft fins like split fins, who want to keep the feet warm in very cold conditions. Easy to put on despite no zip, the radial sole sweeps up the back affording great grip at most angles. For divers there is a fin stop on the heel to help retain strap on fins.
