Lingerie Mart 9 Bone Latex Waist Trainer Vest w/ Double Velcro Belt and YKK Zipper LM210267. This ultra-high-quality black latex waist trainer vest features an exclusive “Double Velcro Belt” design and top quality YKK zipper. It trains the tummy muscles and features the best compression technology currently available on the market. This waist trainer vest reduces inches from your abdomen. Vest design helps eliminate and smoothen back fat for a much sleeker appearance under clothes or tops. Other features include: Wide shoulder straps to reduce the pressure on the shoulders. Double waist straps increase the compression on the tummy and waist. YKK zipper and 4 inner clasps provide a locked fit, giving firmed and flattened midsection. 9 steel bones prevent rolling and make the support of the waist and abdomen is more effectively. Latex will increase the temperature on your abdomen, which will help you sweat more and reduce more body fat.