Under Armour ArmourFit Strapped Mouth Guard [Senior] Made of latex-free material. Not recommended for use with braces Sits close to the skin for a streamlined fit without the squeeze of compression New ArmourFit technology provides a dentist-like fit, chew-resistance, and allows you to talk and breathe easily ArmourFit material molds to teeth for a tight, comfortable custom fit Includes Strap. Generally, size Youth (age 8-11) and size Adult (age 12+)