The Best Sauna Vest for Men. Material: inner 100% polyurethane; Outer 90% polyester fiber and 10% spandex. Sauna sweat effect in love handles and fat belly,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 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 of Sweat Sauna vest Hand wash in cool water with gentle detergent and let it air dry. Better to wash it after each use,particularly after workout for fresh. No Machine Wash/Bleach/Ironing,to maintain shape.