Under Armour - Knockout Tank. Color Castlerock/Black. On sale for $26.98. MSRP $35.00.. 4.6 out of 5 starsAdd to favorites. 0 people have favorited this+6Brand NameUnder ArmourProduct NameKnockout TankGenderWomen'sColorCastlerock/BlackPrice$26.98MSRP: $35.00Rating5Rated 5 stars out of 5(21)