Now upgraded with stronger magnets and varying stiffness! <br/> (clip the softer half on the inside of your shirt and the stiffer one on the outside)<br/><br/>How It Works :<br/> Whole nights shirt clip solution creates a firm bump on your back that makes you adjust your sleeping position to the side or stomach, which ensures your airway is not blocked. <br/><br/>Comfortable and Easy to Use:<br/> It can be easily attached to any clothes. Strong magnets with a non-slip layer make sure that the magnetic ball stays in place for the whole night. No need for special straps or belts.