Under Armour Kids - Knockout Tank (Big Kids). Color Sonar Blue/Glacier Blue/Glacier Blue. Low Stock. On sale for $22.68. MSRP $28.00.. 4.7 out of 5 stars1 left in stockBrand NameUnder Armour KidsProduct NameKnockout Tank (Big Kids)ColorSonar Blue/Glacier Blue/Glacier BluePrice$22.68MSRP: $28.00