SIRENA RIB TANK - SIZE MEDIUM Worn once, washed and air dried. One of our most popular everyday tanks, made of our softly textured feather rib fabric, is a must-have whether worn on its own or as a fitted layer. We love this basic bra-friendly tank tucked or untucked. Fitted Premium Feather Rib: 95% Cotton, 5% Spandex Scoop neck Sleeveless Machine Wash Cold, Tumble Dry Low