vinyl PROMOTES PROPER POSTURE: By gently pulling the shoulders back, the ACE Brand Posture Corrector reminds you to assume a correct posture; this package includes 1 ACE Brand Posture Corrector PERSONALIZED COMFORT: This posture support is designed with fully adjustable, hook-and-loop shoulder straps to provide personalized comfort and a secure fit CONTOURS TO YOUR BODY: The stretchy neoprene materials contour to your body for a streamlined look QUALITY DESIGN: A low profile fits discreetly under clothing, while the repositionable back buckle pad provides an enhanced fit EASY TO USE: Simply slip on the back posture corrector, and slip it off like a backpack to minimize the time you spend taking this posture support on and off (refer to directions)