Roludom Men's Slimming Trimmer Body Shaper Vest Underwears Tank Material: 80% Nylon + 20% Spandex Stretchy Firm Tummy Belly Control Slimming Body Shaper Vest Undershirt Magic Compression Muscle Shirt 5 colors to choose(black,white ,blue,purple,gray) Improve muscle efficiency and reduce muscle tremors and shaking Use the size chart to select your size. If you prefer a looser fit, go up a size.