Under Armour Boys' HeatGear Armour Up Fadeaway Fitted &frac34; Leggings 90% Polyester, 10% Elastane Imported Fitted: Next-to-skin without the squeeze HeatGear fabric is ultra-soft & smooth for extreme comfort with very little weight Stretch-mesh calf panels deliver strategic ventilation 4-way stretch fabrication allows greater mobility in any direction Moisture Transport System wicks sweat & dries fast