The Cool Touch Tank is constructed from a polyester-spandex blend. It features a curved hem, crew neck, perforated side panels. This tank was designed to keep you cool during your most rigorous activities. Solid fabric: 90% polyester, 10% spandex. Perforated fabric: 83% nylon, 17% spandex. It has a cool touch technology, moisture-wicking, and four way stretch. It runs true to size with a slight relaxed fit.