I've suffered from snoring all my life and have tried so many products so please let me tell you my experience. All these "off the shelf" products in my opinion are waste of money, yes they can work for some people but 9 out of 10 times you will end up throwing it in the bin or never wearing it. First of all, they all require you to apply heat or adjust them to fit your gums and teeth and trust me it is almost impossible to get a perfect fit. You also need to wear them and get used to them, so even if you get the shape right there is no guarantee you will be able to sleep with what feels like a hockey puck in your mouth. And this creates so much saliva in your mouth which you can't even swallow in a normal way because of the mouth guard, so you end up with a soaking wet pillow in the morning and your head stuck to it. If you do however think you can put up with all of this then go and see your local orthodontist or dentist to custom make the mouthpiece which will fit you perfectly, I got mine done for £80 which sits on my lower jaw only or £200 that fixes your lower and upper jaw in place, just like these devices try and do. Yes it's more money but at least you will give yourself the best chance to resolve your snoring. Don't buy this nonsense.