Boys' Diamond Series Training Top. Our premier fitted, shortsleeve base layer built for baseball. This close fitting garment layers perfectly under your uniform with a combination of HeatGear? and HeatGear? Mesh, moving moisture and dispersing heat ? and ultimately keeping you cool and comfortable. Extra length in the body ensures this garment stays tucked in. Recommended for Baseball. FABRIC TECH: 100% Polyester. Imported.Fit: Loose Sizes: Youth Small,Youth Medium,Youth Large, Colors: Black,Medium Grey Heather,