The altis gravel edition offers riders an ultra-lightweight helmet with an active cooling system equipped to provide a safe and comfortable fit that goes the distance on your gravel riding adventures. Features smartshock rotational protective system (11 point). High density eps foam injection molded with polycarbonate in size specific molds (xs/s, s/m, and l/xl). Massive airflow with an impressive 14 ventilation ports. Expanded coverage while still lightweight. Washable, moisture-wicking anti-microbial liner. Adjustable ratcheting fitment system. Nexus push release snap-buckle.