Under Armour Kids - HeatGear® Armour Mock Long Sleeve (Big Kids). Color White/Black. On sale for $33.25. MSRP $35.00.. Add to favorites. 0 people have favorited this+2Brand NameUnder Armour KidsProduct NameHeatGear® Armour Mock Long Sleeve (Big Kids)ColorWhite/BlackPrice$33.25MSRP: $35.00Rating