Larcele Mens Base Layer body shaper Heatmax Long-Sleeve Undershirt Warm Up Material:55% HEATMAX 37% NYLON + 8% SPANDEX Shaping Chest with plain weave ,ventilate perspiration X-shaped Pulling back and correcting posture Low Round Collar Design Match all kinds of Clothing SIZE:Chest: M(36-39"),L(40-43"),XL(44-47")