Dorsal Surf Changing Mat and Waterproof Wetsuit Bag for Surfers Kayakers DORSAL Change Mat/Wet Bag. Change on the durable polyester mat then use the drawstring system to convert into a wet bag to help shield the wetsuit smell from creeping into the rest of your vehicle. Details: Durable PU backed 150D rip-stop nylon base, soft 210D polyester side walls, and barrel lock drawstring fasteners by DORSAL. Draw String and Barrel Lock Closure Converts to Wetbag Protects Wetsuit From Sand and Dirt and keeps car clean Built to Last