NeoSport 5/3mm Men's NRG Short Sleeveless Short sleeveless triathlon wetsuit allows full range of motion for efficient swimming and energy conservation Extra-wide arm openings eliminate unwanted binding and allow full muscle flex; fabric trim at perimeter is smooth and durable high-stretch nylon with Lycra Speed Skin neoprene provides maximum buoyancy and glide; five-millimeter chest panel and three-millimeter back panel help you skim along top of water, reducing drag Leg openings above knee increase kick efficiency and decrease drag, while wider exit opening curtails heel snag for faster transition times; Easy-Out zipper stays put in water, but is easy to grab on land, speeding transitions Includes limited one-year manufacturer's warranty