Posture Corrector is an adjustable upper back brace designed to provide clavicle support and neck, shoulder, and back pain relief. It can be worn in two ways – under or over clothing. It is made of good quality material that won't disconnect once worn. The product comes with additional straps and is adjustable, making it one size fits all. Some users have reported moderate lower back pain when using it for the first and second time. It can also be worn during the day but not recommended while sleeping.