The addition of super-stretch neoprene in the arms, shoulders, and back provides complete freedom of arm and shoulder movement, bringing performance to an all-new level. Super-stretch neoprene is softer and stretches much more in all directions with less effort. Flatlock stitched throughout for comfort. Chest and back are smoothskin. A short back zipper surrounded by super stretch makes these suits feel virtually zipperless. The shorty is all 2mm with O-rings in arms and legs.