How does this vest works and make you sweat like crazy, burn more fat, produce heat and weight loss? There are four main steps: 1. Firstly by raising core body temperature, so your body has to work far harder to cool down and maintain a healthy temp. (this is called to thermo regulate).In this process, body burn off at least 50% more fat. 2. Secondly they cause the body to produce a heavy profuse sweat. To create sweat your body uses up massive amounts of fat and energy and burns 0.7 calories for every gram you produce. This actually burns off at least twice amount of calories and fat, accelerating quick weight loss to a tremendous level. 3. Thirdly they put you straight into the fat burning zone which usually takes over 30mins. So your actually burning fat for your full workout instead of just the average 20mins of a 1hr session. This makes fat burning 3 times more effiecient. 4. Fourthly when wearing the vest your metabolic rate is increased by roughly 30% giving you an extra 30% more fat burn whilst working out. Altogether they burn off at least twice the amount of fat and make you lose weight twice as fast. NOTE: Please compare our size chart selection. This neoprene weight lose shaper have some material smell, After the first cleaning and drying, the odor will gradually disappear. Washing instructions: The best cleaning time for Neoprene Slimming Vest is immediately after exercise.Hand wash in cold water with a soft detergent. 100% SATISFIED SERVICE-- For Whatever Question,please Tell us first &We will solve your request ,return or refund is available,will make you satisfaction