AIRWAAV ENDURANCE Performance Mouthpiece is made for endurance athletes who are trying to get their personal bests. This patented and scientifically proven mouthpiece can help you run better for longer by: Increasing your airway opening by up to 25% which results in improved breathing. Reducing your respiratory rate by 20% which causes less lactic acid production to increase your endurance. Reducing cortisol build up levels by up to 50% which leads to fast recovery. Package includes: 2 mouthpieces, 1 antimicrobial case, and fitting instructions. This mouthpiece directs your tongue down and forward when you gently bite down, creating an optimal airway opening. It has a low profile design with form-fitting bars stemming from the bite plate to provide a secure, lockdown fit and is comfortable enough to run in for miles. Unlock your full running potential with the AIRWAAV ENDURANCE Performance Mouthpiece.