Open cell neoprene is a porous neoprene variant that does not have an inner protective liner. What this means is that raw neoprene foam is in direct contact with the users skin. This type of neoprene is typically more delicate than “lined” variations but offers a host of advantages. There is no barrier between diver and the insulating neoprene. Because of this open cell neoprene is warmer and more stretchy than lined neoprene. All JBL 2 piece wetsuits are made from the highest quality open cell neoprene.