Smoothskin is actually the upper and lower crests of the master foam after it comes out of the mold. Think of an angel cake that was just baked. Imagine the crusty surface that is smooth since it was the one exposed to the heat of the oven. We at Yazbeck, use that “crust” as a waterproof seal. You will find it in most of the Yazbeck wetsuits used as a face, wrists and ankles / leg opening seals. This is also the part that enters in the fabrication of our legendary Freedive Hunter socks.