Evolution Wheel Ratchet is easy to use and creates a firm comfortable fit., High-Density Polyethylene (HDPE) shell designed with five raised channels for strength, and a longer back for extra protection, Wide polyester textile webbing harness, Universal slots to fit various accessories, 6-Point Suspension System, Meets ANSI requirement for Reverse Donning and Lower Temperature, Meets ANSI/ISEA Z89.1-2009 standard for Type I, Class E, Chamlon™ sweatband, Packed ready-to-wear with no assembly required, Unique “3D Adjustment" provides a precise helmet fit using harness depth settings,