SETENOW Women's Body Shaper Hot Sweat Slimming Sauna Vest Neoprene Shapewear for Tummy Fat Burner Weight Loss neoprene Imported Material:15% Polyester, 70% Neoprene, 15% Nylon.It's special material increases body temperature and absorbs sweat so you're always dry on the outside. Comfortable, light-weight, stretchy fabric molds and moves with your body while performing your daily activities. It matches with any combination of workout tops or can even be worn under everyday clothes. Best athletic product to keeps your body warm and heat up your core abdominal area making you sweat more than usual; Scientific design and compression help you correct posture, flatten abdomen, firm tummy. This shaper have some material smell, it's pretty normal and would be gone after a few time washes. Washing instructions: Hand wash in cold water with a soft detergent. It is recommended to wash it after each use, particularly after exercising. Please note: the size is the true US size now! Please refer to Size Chart in the image section in the left to choose your right size.