NEW AND IMPROVED DESIGN. THICKER NEOPRENE AND REINFORCED ZIPPER- HIGHEST QUALITY 3MM- Keep water cold all day even in 100 degree weather. Built in cell phone pocket, key holder, money/ID/credit card holder to free-up your hands and pockets. Not just for weightlifters, bodybuilders, and fitness Enthusiast. Suitable for camping, hunting, working outside, construction, living in a hot environment, monitoring water intake, hiking, fishing, golfers, road trips and more.