No zipper design. Material: 70% Neoprene, 15% Polyester, 15% Nylon. It's special material increases body temperature and absorbs sweat so you're always dry on the outside.Our brand 'MIRANCO' has been registered in US by USPTO.Trademark NO:5090299. It does all of this while offering amazing comfort; It makes you look inches smaller and pounds thinner instantly; It hides bulges, bumps and rolls making you look tight and trim; It will help you fit into your favorite pair of jeans or suits comfortably.. This fast weight loss sport sweat enhancing thermal vest is made up of neoprene, it is specially made for workout exercise, which can make you sweat 3 times more like never before and help to flatten your tummy, Lose inches and melt the fat away!. Comfortable, lightweight stretchy fabric and moves with your body while performing any activity. It looks great and matches with any combination of workout tops or can even be worn under everyday clothes.. MIRANCO shaper preserves body heat and stimulates sweat during exercise. Its revolutionary design helps you achieve results faster and easier..