Under Armour - Knockout Tank. Color Castlerock/Black. On sale for $30.07. MSRP $35.00.. 4.6 out of 5 stars+8Brand NameUnder ArmourProduct NameKnockout TankColorCastlerock/BlackPrice$30.07MSRP: $35.00Rating5Rated 5 stars out of 5(21)