The Next Big Thing that's been made smaller. Introducing the Nano Double. A Dual Arch, low-profile mouthguard for upper/lower dental protection with enhanced fit and comfort. The Double Monocoque Shock Frame, integrated Tri-Bite and Gel-Fit eliminate the need for large, mouth-expanding and fatiguing traditional Dual Arch mouthguards with center breathing channels. Incredible stability and full-wall upper/lower coverage provides an important barrier against jaw uppercuts and side impacts, protecting teeth as well as helping to reduce shock that might affect concussions. Adult size.