Features of the 100% AIRCRAFT Composite Helmet Lightweight Design: Featuring a fiberglass composite shell Active Cooling System: Maximizes airflow with a staggering 25 ventilation ports Antimicrobial, washable and replaceable comfort liner, cheek pads and chin strap cover Emergency Release Cheek Pads: For quick, safe removal Integrated Compartment: Accepts inflatable emergency release systems Compatible: With most popular neck brace systems Steel DG??Ring Buckle: Provides a secure Fit while limiting weight Perfect Fit: Engineered with 2 Shell sizes and 3 EPS Sizes and 4 Cheek pad options Adjustable Visor: With machined lightweight aluminum screws