Under Armour Cold Gear Compression Mock Neck Long Sleeve Shirt Mens Size Large Purple Measures 18 inches pit to pit Length is 28 inches NWT Compression: Ultra-tight, second-skin fit. Dual-layer fabric with an ultra-warm, brushed interior and a smooth, fast-drying exterior. Stretch-mesh back and underarm panels provide strategic ventilation without sacrificing warmth. 4-way stretch material moves better in every direction. Material wicks sweat and dries really fast. Anti-odor technology prevents the growth of odor-causing microbes. Ergonomic design keeps seams off of high abrasion areas. Mock neck construction for added coverage & warmth. Dropped, shaped hem. 87% Polyester/13% Elastane. Machine wash cold with like colors.