Material: 97%Polyester 3%Spandex Sweat like crazy,produce heat in workout to accelerate sweating for weight loss. Waist trainer vests make you sweat crazy,5 times than normal,also keep your core body warm during cold days. This neoprene sauna Suit help enhance the abdominal and spinal support as you workout. Maximizes fat burning for weight loss, zipper tank top comfortable to wear for daily activities. Warm tips: Hand wash with normal temperature water and soft detergent after worked out and hang it to air dry. Don't machine wash. Don't iron. Don't bleach.