ADVANCED SWEATWEAR: Only uses a heat-trapping polymer fabric to boost your natural body heat and stimulate sweating with any type of physical activity. Wearing while working out or while performing daily activities creates a hot sauna-like experience. Your body temperature will rise, causing you to sweat more. SLIMMING BODY SHAPER: Thanks to specially engineered top-layer performance compression fabric, you'll instantly look slimmer and more toned the moment you put it on. If you want a feeling of a flat stomach, strong core, and a fit look, is your ideal workout gear. Compared to low-par neoprene alternatives, doesn't smell, it's lighter, dries quicker, and it's machine washable! COMFORT & VERSATILITY: has been designed so that it's incredibly light and comfortable to wear even for extended periods. It molds and moves with your body during workouts at the gym or work. Exceptionally flexible, featuring a traditional tank top style you can wear it underneath your clothes completely hidden without adding extra bulk. The polymer material repels moisture to quickly dry and always stay fresh to not feel wet or sticky from the excess sweating. ULTRA-PREMIUM FABRICATION: exclusive blend of fabrics have been specially selected to create the ultimate men's tank top in Advanced Sweatwear. Consisting of two layers: the inner thermogenic polymer fabric increases your core temperature to promote sweating. The outer performance compression fabric instantly slims and shapes your figure. Finished with an anti-slip waistband to ensure it stays in place and doesn't shift on your body, especially during intense workouts. Please check out our SIZE CHART attached at the end of image group. And we highly recommend our customer to SIZE UP if you are between two sizes.