Most athletes clench their jaws when they're training hard or competing. It's a natural response—but one that hurts performance. UA's ArmourBite® Performance Pack brings athletes patented jaw-positioning technology that maximizes air intake to increase endurance and improve your reaction time by up to 12%. With ArmourBite®, your body will produce up to 25% less energy-sapping lactic acid so you can deliver an up to 20% stronger performance. Give your training or game-day routine a boost that's been scientifically proven. You just need to prove it to yourself.