Under Armour HeatGear® Mock Long Sleeve Boys. HeatGear® is our original performance baselayer—the one you put on first and take off last. So we made it extra comfortable by wicking sweat and stretching so you can move no matter what. Super-light HeatGear® fabric delivers superior coverage without weighing you down. Mesh underarm & back panels for strategic ventilation. Material wicks sweat & dries really fast. Ergonomic design keeps seams off high abrasion areas & increases durability. Hybrid raglan sleeve construction for added range of motion & comfort. Gear up for any activity in the Under Armour Kids Heat Gear Armour Mock LS in WhiteBlack. The ideal base layer for adding extra warmth to whatever youre doing, this tight fit, longsleeved training top is designed to be warming, supportive and flexible. The Kids Heat Gear Armour Mock LS is made from super lightweight, soft and smooth HeatGear fabric that wicks sweat by moving moisture away from your skin for faster evaporation, so you stay dry, comfy and focused. The fourway stretch fabric moves with you for freedom of motion, with a mock neck for extra coverage to ward off cold winds. Under Armour Heat Gear Armour compression top Soft and smooth HeatGear fabric 4way stretch construction Sweatwicking material Mock neck construction for added coverage 90 polyester, 10 elastane. HeatGear fabric is ultra-soft & smooth for extreme comfort with very little weight. 4-way stretch construction moves better in every direction. Material wicks sweat & dries really fast. Mock neck construction for added coverage - Style #: 1369477. 90% Polyester/10% Elastane. Imported - Wash garment inside out. Machine wash cold with like colors. Use only non-chlorine bleach when needed. Tumble dry low. Do not iron. Do not use softeners. Do not dry clean.