Womens Waist Shaper GYM Sport Aerobic Workout Sauna Tank Top Vest Reversible, can wear it in reverse, both side as you like; Material: 80%Neoprene 20%Nylon , inner is rubber; Detoxify your immune system, Burn more calories, Can be used everyday at home, work, or the gym; Sweat more than usual, Increase your metabolism; Moves with you through any type of exercise, whether it be MMA, boxing, aerobics, calisthenics;