The TG Posture Garment trains key muscles to improve posture. Poor posture is the result of carrying backpacks, sitting at computers typing, and texting ALL day. The Posture Garment is the antidote to that problem. It is designed to draw the shoulders, head, neck and spine backwards, retraining muscles for ideal posture. Easy to apply Breathable and lightweight Self-adjusted tensioning system INSTRUCTIONS: During the first 2 weeks, wear 1 hour every other day while stationary or sitting (e.g. watching tv, reading a book, working on computer) Then wear 1.5 hours every other day for week 3 and 4. After 4 weeks, continue to train muscles as desired. SIZING: Sizing: Women's Size (dress size) Men's Size (chest size) Youth 26 - 28" (dress size) X-Small 0 - 2 30 - 32" Small 4 - 6 34 - 36" Medium 8 - 10 38 - 40" Large 12 - 14 42 - 44" X-Large 16 - 18 46 - 48" XX-Large 48 - 50" Guarantee: We guarantee your posture will improve and your shoulders will become healthier in the Posture Garment (when worn as directed), or your money back. If you are not completely satisfied with your Topical Gear purchase, please contact us within 30 days and we will exchange your product or provide a full refund.