Heavy-duty rubber Exoskeletal Shock Frame and Gel-Fit liner provide maximum protection, fit and comfort in an easy to fit triple layer design. Features: - Gel-Fit Liner, a material that takes an exact impression of the teeth, providing a tight, comfortable fit. - Exoskeleton Shock Frame with integrated jaw pads provides maximum impact protection for the teeth, jaw and brain. - Breathing channel that allows for easy breathing while clenched.