The GEL-FIT™ LINER custom molds to lower teeth for a tight, comfortable fit. MORA™ PERFORMANCE ENHANCEMENT- when fitted and worn correctly, positions the lower jaw down and forward and the tongue up onto the roof of the mouth, which may increase strength and athletic performance. This low profile mouthguard fits on lower teeth for unrestricted breathing and more natural speaking while providing lateral jaw stability and impact protection. This mouthguard is designed specifically for helmeted sports where a face mask is used. Lower teeth coverage design meets NFHS mouthguard rules.