JSP Evolution™ EVO6100 Deluxe Vented Hard Hat features a strong HDPE shell, a 6-point suspension system and comes assembled. Unique “3D Adjustment” provides a precise helmet fit using harness depth settings. Vents help reduce inside helmet temperatures. Chamlon™ Sweatband. Universal slots fit various accessories. Meets and exceeds ANSI/ISEA Z89.1-2009, Type I, Class C standards. Meets ANSI requirements for Reverse Donning and Lower Temperature (LT). Wheel ratchet creates a firm comfortable fit.