Under Armour - Rival Muscle Tank. Color Castlerock/Black. On sale for $25.54. MSRP $30.00. 15% off. 3.7 out of 5 starsAdd to favorites. 0 people have favorited thisBrand NameUnder ArmourProduct NameRival Muscle TankGenderWomen'sColorCastlerock/BlackPrice$25.54MSRP: $30