Skip the boil – Ready to wear right out of the package Pliable thermo rubber provides cushioning comfort Protects teeth, braces and lips Two breathing channels for maximum airflow Custom fitted with double impressions Highest quality material for greater strength and comfort One-piece adjustable strap Dental warranty. Selecting a Size: Pee Wee - Model #22: Ages 8 and under Youth - Model #23: Ages 11 and under Adult - Model #25: Ages 12 and up