Rip Curl Mens Dawn Patrol 2mm Chest Zip Spring Suit is built with E5 Ultralite Neoprene, our premium high stretch, lightweight neoprene with 30% more stretch, 20% lighter and 10% warmer than E4 and easy top-entry system with lightweight zipper for chest zip closure. Zip up for low profile, no blowouts. Triple glued, double-stitched seam does not fully penetrate neoprene allowing for a waterproof seam with high stretch and comfort