Poor posture, including shoulder slump and forward head position, can lead to shoulder pain, back pain, neck pain and headaches. The Posture Support Corrector pulls the shoulders back into the neutral position to properly align the spine. Designed to wear under clothes, this posture corrector has an adjustable strap design for a comfortable fit. It's constructed of nylon and Lycra with crisscrossed reinforced elastic bands and a front hook closure. The Posture Support Corrector is machine washable. Features Helps restore posture and reduce back strain. Cotton and Lycra fabric blend for comfortable fit. Custom fit with hook and loop adjustment. Quantity: 1 Color: White Size: Small, Medium, Medium/Large, Large, or X-Large Material: 80% Cotton and 20% Lycra Manufacturer: Duro-Med Made In: USA Indications: Helps restore proper posture and reduce back strain and pain. Options: Small (6224S) Medium (6224M) Medium/Large (6224ML) Large (6224L) X-Large (6224XL) Please note: If you are between sizes, the larger of the two sizes will typically fit more comfortably while still providing support. For women, the chest measurement should match bra size.