Fiberglass composite. A perfect combination of durability and performance. Tough, through color, fiberglass reinforced, hi-temp composite -- resists cracking and chipping. Kevlar reinforced fiberglass composite, lightweight high-performance design. Non-corroding, high temperature, glass-filled polymer faceshield/goggle hardware. Ultra high temperature (TPR) edge trim will not melt or drip. Nomex chinstrap with one-hand quick release buckle and postman slide -- allows quick and easy adjustment Choice of Nomex or Pbi/Kevlar earlap -- for increased neck/ear coverage and protection. Patented shell release -- increases neck & head protection. High-temperature foam cap -- increases thermal and impact protection. Higher temperature impact cap liner resists distortion at higher temperatures. Exclusive SCBA interface front headband adjustment -- matches the fit of any SCBA mask. 3-position rear ratchet height adjustment -- insures a secure and comfortable fit for all head sizes between 6-3/8 - 8-3/8. Choice of removable flannel or leather cushion liners for washing and upgrading -- provides greater ease and comfort.