Description: - Material is hydrophobic; it will not absorb water and will not deteriorate - Shapes to braces to provide protection, safety and custom like fit to the teeth, jaw and gums - 45 seconds microwave or 30 seconds easy boil and bite for custom-like fit - Re-fittable. Latex Free. Highly chew resistant - No tether Strap. Generally, size Youth (age 8-11) and size Adult (age 12+)