Can't use it when sleeping. 
Features:
1. Corrects your posture and restores healthier stature to your body.
2. Reduce lower back pain, slouching and hunching.
3. Contribute to growing development.
4. Health products for men and women bodybuilding, for office daily wear.
5. Fully adjustable, comfortable & easy to wear.
Functions: 
1. Helps support, comfort & relieve aches & pains. Helps improve breathing, relax muscles and straighten neck, spine and your head. 
2. Helps pull the shoulders back to stand tall & sit up straight. 
3. Can be discretely worn under clothing.
4. Suitable for children (10-15years)

Package include:1*Posture Corrector belt(without retail box)