Under Armour - Knockout Tank. Color Castlerock/Black. On sale for $27.61. MSRP $35.00.. 4.6 out of 5 stars+7Brand NameUnder ArmourProduct NameKnockout TankGenderWomen'sColorCastlerock/BlackPrice$27.61MSRP: $35.00Rating5Rated 5 stars out of 5(21)