Interior material: Neoprene Sauna vest with Zipper burn fat more than regular gym clothing, helps posture for back and abs as you workout Vests burn more fat, produce heat in a workout wearing Weight Loss Vest burns fat and accelerating your quick weight loss Material produce higher compression resulting in more sweating and help your body to sweat out harmful fats. Enhances the abdominal and spinal support Wear the Shaper under jacket or dress around the house, when you're exercising,running errands or going out. You'll have a firmer posture, lower back support, and be sweating all day