PLEASE NOTE: THIS PRODUCT IS FOR BACK SNORERS ONLY! Snore Shirt will not be effective if you snore while on your side and stomach. Beneficial for Sleep Apnea. PRODUCT FEATURES: - Probably the simplest and most comfortable solution to snoring. - High Quality breathable cotton - 30-day money back guarantee if you don't see desired results. **Tennis ball is not included, please purchase separately. (THIS PRODUCT IS NOT A MEDICAL DEVICE) RECOMMENDED BY HEALTH EXPERTS: By Renowned Dr. Oz on Oprah show just search in "Ask Oprah - how to stop snoring?" in google search and WEBMD, just search Webmd Sleep Apnea Tennis Ball in google. (*TENNIS BALL is NOT INCLUDED, please purchase separately) SIMPLE SOLUTION: People all over the world say they have used this "snore no more" trick effectively to help them stop snoring and sleep better! HOW IT WORKS? Research shows that 80-85% of snorers only snore while sleeping on their backs. Stop Snoring Shirt assures that your sleeping position is either on your side or stomach. By adjusting your sleep position, it assures that your soft palate does not block the airway and can eliminate or substantially reduce snoring!<br> Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store