This is a luluLululemon Racerback Running & Training Tank – Black – Size 4 (Fits Like XS/S) Pre-owned, Good Condition This sleek Lululemon athletic tank is designed for running and training, featuring a seamless construction that helps prevent chafing and delivers a smooth, second-skin fit. It’s pre-owned but in good condition with no stains, tears, pilling, or fabric pulls. Though the original receipt lists the size as 4, it feels like it runs a bit bigger for Lululemon specifically. I have other size 4 lululemon tops and this one is a bit looser of a fit. I think it is best suited for someone who typically wears a size small or XS in clothing. Product Details: Fit: Slim fit, waist length Fabric: 54% Nylon, 40% Recycled Polyester, 3% Elastane, 3% X-Static® Nylon Technology: Silverescent™ powered by X-STATIC® helps inhibit the growth of odor-causing bacteria Care: Machine wash cold Flat Measurements (taken with garment lying flat): armpit to armpit 14.75" top of shoulder to hem 21"