Posture Corrector Portable Please allow slight dimension difference

Please allow slight dimension difference due to different manual measurement

and a "negative" button

it's really not that difficult

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Material:High Quality Polyester and Cotton

Posture Corrector Portable Please allow slight dimension differenceSpecifications: 1. Brand: MOOXNO 2. Name: Back shoulder posture corrector 3. Material: Cotton, Neoprene 4. Color: White, Blue, Green, Grey, Purple, Grey Blue, Grey Purple 5. Size: S, M, L, XL, 2XL, 3XL 6. Suit for: Adult Men and Women 7. Applicable Scene: Habitual camel back, high and low shoulder, shoulder joint pain, arthritis, acromion joint loosening, clavicle fracture, clavicle dislocation, scapular fracture and so on 8. Due to various monitors