Under Armour Boys' ColdGear Mock Long Sleeve White / Black YXS

Ultra-warm - The long sleeve thermal features a dual-layer fabric with an ultra-warm, brushed interior and a mock neck for added coverage and warmth. Strategic ventilation - With a stretch-mesh back and underarm panels, the thermal top gives breathability just in the places you need it. Smooth and stretchy - The compression top's 4-way stretch material gives you full freedom of movement throughout the training session. Sweat-wicking - Even in fast-action, stay cool with the ski baselayer's sweat-wicking, fast-drying material, which features anti-odour technology. Material and fit - Under Armour Boys' UA CG Armour Mock LS, boys' thermal base layer, compression top, material: 87% Polyester/13% Elastane.