While wearing the TapouT Mouthguard the Temporomandibular Joint, (TMJ) fills with fluid as a natural lubricant and shock absorber.Advanced Gel Technology assures extreme comfort and fit.Top and bottom jaw stabilization technology.2 mouthguards. While wearing the TapouT Mouthguard, the Temporomandibular Joint, (TMJ) fills with fluid as a natural lubricant and shock absorber. The TapouT Mouthguard properly positions your TMJ during stress related activities, so the combination of natural fluids and our Concussion Defense System gives you Anti-Concussion protection. The TapouT Mouthguard warranty is twice as much as any other mouthguard on the market. Giving every coach, parent and athlete an extra sense of security and piece of mind that they are using excellent protection.The Tapout Mouth Guard features:- Advanced Gel Technology assures extreme comfort and fit.- Air flow channels create maximum breath-ability for superior endurance and performance.- Top and bottom jaw stabilization technology.- Includes 2 mouthguards. Disclaimer:Boxing and Martial Arts are contact sports. Users of this equipment are subject to personal injury. These products have a degree of protection but are not warranted to protect the user from injury. Wearing a mouth guard is always recommended when participating in any athletic activity.