Nano protection for upper and lower teeth for high impact sports. Perfect for MMA Fighters, Boxers and Jiu-Jitsu. This dual-arch, low profile mouthguard is designed to enhance upper and lower jaw protection. Featuring a double monocoque shock frame, it absorbs and disperses impact away from the point of contact. Classic Fit: Traditional and original, all-around performer. High-impact technology for high-impact sports. Protects, stabilizes both upper & lower teeth/jaw.