High-density polyethylene (PE) shell with double inner rim design to reinforced the helmet structure for higher impact resistance, lightweight, tough and durable. Four-point adjustable pinlock PE suspension for fast and easy adjustment to fit the head size from 6-1/2 to 8. The ventilation holes on the top let air circulate, keep the head cool and comfortable. Slotted sides to accommodate accessories, such as face shields, ear mufts. Also available for pinlock nylon suspension, ratchet PE suspension and ratchet nylon suspension. Chin strap not included.