Posture orthotic device: open the shoulder and straighten the back, provide effective posture correction, improve confidence and reduce pain Comfortable support: soft shoulder straps can reduce friction, correct posture, straighten the back, without penetrating into the skin Men's/Women's Size: M is suitable for 23-32 inch waist, 27-39 inch chest. L size is suitable for 33-41 inch waist and 31-43 inch chest. XL is suitable for 38-50 inch waist and 43-55 inch chest. Simple spinal alignment: just put on the posture orthotics like a backpack, fasten the belt, pull the elastic belt, and connect it to the belt Correct at any time: suitable for work, family or light exercise; Start using male and female postural orthotics today to improve your posture Tips: Please choose a size according to your waist circumference and compare it with the size chart. Product Description Q&A: Q1: Which size suits me? A1: The best way is to measure the waist circumference and compare it with the size chart. Note: The size may be different from the standard clothing size (for example, size M may not be suitable for people wearing medium shirts). Q2: Can I wear this pose corrector without underwear? A2: Although the material of the pose corrector is breathable and skin friendly, we suggest you wear a T-shirt to ensure your comfort. Q3: Can I wear it when I sleep? A3: No, it is not recommended to wear posture orthotics for more than 3 hours each time. Q4: How to clean the posture orthotics? A4: We recommend washing hands to prevent stretching. When cleaning, remember: 1. First, remove the two rear support plates. 2. Rinse gently in room temperature water with a temperature of no more than 86 F (30 C) for no more than 15 minutes. 3. Hang it to dry and avoid direct sunlight. Q5: How long should I wear it every day? A5: When you start wearing it, we suggest 20 minutes a day. As your body adapts, you can gradually extend this period of time.