Heat Trapping Shirt sweat vest for Men🔥: This sweat vest is made of Polyester and spandex. Inner fabric use polymer heat-trapping material, raise your body temperature in a short time, stimulates your body to sweat. Inner layer is waterproof, keep the vest stay dry outside and make you feel comfortable after long time workout. It is a good choice to enhance your workout performance and makes you achieve your goals easier when you go to gym and do daily exercises. Works Best paired with Issabrickhouse "HOT CREAM".