This is one of the lightest, most breathable shirts we make—and your new go-to. Any sport, any training, any time. Product Details: Insanely soft, breathable fabric 4-way stretch material moves better in every direction Material wicks sweat & dries really fast Classic racerback design with wordmark taping details Odor control technology minimizes odor Fabric: 90% Polyester/10% Elastane Product Name: Under Armour Knockout Womens Tank Top - Black/White Under Armour Code: 1389851-001 Option: X-Small, Small, Medium, Large, X-Large