XL-S Back Shoulder Posture Corrector Adult Children Corset Spine Support Belt Corrective Support Orthotic Correction Posture Healthy Direct Sales Size: S,M,L,XL,XXL Colors: White, Black Packaging: 1 Posture Correction Strap (packed by opp bag) Cannot be used while sleeping. feature: 1. Correct your posture and get your body back into a healthier posture. 2. Relieve low back pain, listlene and hunched back. 3. Promote development. 4. Bodybuilding and health care products for men and women, daily wear in the office. 5. Fully adjustable, comfortable and easy to wear. Function: 1. Helps support, comfort and relieve pain. Helps improve breathing, relax muscles, and straighten neck, spine and head. 2. Help pull your shoulders back to stand tall and sit up straight. 3. Can be worn under clothes alone. 4. Suitable for adults or children Hi, this corrective strap is adjustable, you can adjust it with velcro if you find it tight.