IST Adult Jumpsuit with Super Stretch Panels in Key Areas (Men's, Multiple Thicknesses Available) Soft Nylon II neoprene is used throughout, flat-lock stitched to eliminate seam irritation Fine mesh chest panel and special super-stretch material for maximum range of motion, flexible kneepads for extra durability without hindering movement Large sized back zip (YKK size 10) with leash assists donning and doffing Extra ankle and wrist zips improve fit and minimize flushing Available in a variety of thicknesses to suit your diving, water, or even winter needs