6-Point Suspension System, Universal slots to fit various accessories, High-density polyethylene (HDPE) shell with full brim to protect against sun exposure, rain, snow and dust., Vented hard hat versions have a Class C (Conductive) electrical rating., Meets ANSI/ISEA Z89.1-2009, Type 1, Class E requirements, Meets ANSI requirement for Reverse Donning and Lower Temperature, Unique “3D Adjustment" provides a precise helmet fit using harness depth settings., Evolution Wheel Ratchet is easy to use and creates a firm comfortable fit., Packed ready-to-wear with no assembly required,