With reinforced criss-cross bands to firmly support your back, this posture corrector helps you stand and sit straighter, taller ... comfortably easing back strain and pain. Discreet style features hook-and-loop band closure and shoulder straps for a custom fit. Specify size (measure around ribcage below bust line; garment should fit snugly): small/Med (fits 30-38) or large/x-large (fits 40-48). 55percent nylon/30percent polyester/15percent Spandex. Hand wash. Imported.