IST CWSS0130 2.5mm All Purpose Adult Tropical / Temperate Watersport Shorty Soft 3mm Nylon II neoprene is used throughout, flat-lock stitched to eliminate seam irritation Lycra side and arm panels for maximum range of motion, flexible kneepads for extra durability without hindering movement Doubles as an insulation layer under snowsuits for winter sports Back zip with easy-reach leash assists donning and doffing Smooth-skin leg, wrist and neck seals help prevent flushing when worn in the water