BUnder Armour ArmourBite Mouthpiece ReviewbP PP Under Armour ArmourBite Mouthpiece PMicrowaveable, boilable and re fittable. Provides a dentist like fit, Under Armour's ArmourFit Mouthguard is chew resistant and makes it easy to breathe and talk.PMicrowave for 45 seconds or boil for 30 seconds then bite for custom fit. Hydrophobic material will not absorb water and will not deteriorate.