What does the FiberSlim Hourglass Sculpting Self Heating Suptruck Vest do, and how does it work? We are only able to absorb 15% of negative ions through breathing, but when we use our skin to absorb negative ions, the efficiency rises to 85%. Our Vest is laced with a comfortable unique fabric that generates negative ions and promotes weight loss all over the body. The inner fabric generates ions that can penetrate deeply into the body. It also has body-forming properties that help you get the perfect shape you want for your body without much effort! The FiberSlim Hourglass Sculpting Self Heating Suptruck Vest is believed to push arm and sub-mammary fat back into your breasts, helping your muscles return to their proper position for a slimming effect. It also helps to improve blood circulation, and the lymphedema that is controlled by the unique fiber used in the vest can also reduce fat gain and stop sagging of the breasts. OUR GUARANTEE We are confident that we offer some of the best products on the market. Therefore, we provide a 30-day guarantee. We will make every effort to ensure that you are completely satisfied with your purchase. Online shopping can seem daunting. We want you to know that there is absolutely zero risk of purchasing something. We won't make it difficult if you don't love it. We offer email and ticket support 24 hours a day, 7 days a week. If you require assistance, please contact us. Please contact customer service if you have any problems with your purchase.