Patented shell release system retains the impact cap if your helmet is torn off during an incident, shielding you from heat, debris and projectiles Full brim protection with high-temperature edge trim that will not melt or drip Soft black Nomex chinstrap features one-hand quick-release buckle and postman slide for quick removal and adjustment Three-position rear ratchet height adjust for a secure and comfortable fit Front headband adjusts so it does not interfere with SCBA mask flange.