Tulucky Men's Short Sleeve Slimming Body Shirts Front Zipper Shaper Tank Tops Main fabric :90% Nylon /10% Spandex Two layers of powernet fabric compress from chest to abdomen.More convenient full length chest zipper ,instead of 3 row hook eye closure,ensures easy on and off wear each time when you wear it . Hand wash if you don't know which size is for you ,you can refer to the left second photo for suggestion .