Traverse Industrial Climbing Helmet with ABS Shell, EPS Foam Impact Liner, HDPE Suspension, Wheel Ratchet Adjustment and 4 Point Chin Strap, White Secondary Containment One way valves are positive pressure One way valves are positive pressure and open on demand OR INABLILTY TO USE Features a super lightweight ABS shell and a integrated EPS inner shell foam liner that work in conjunction with the highly adjustable 4 point HDPE inner suspension to provide exceptional protection from top of head and lateral impact hazards The Traverse™ Mips® offers a low friction layer that allows the head to move inside the helmet (10mm – 15mm relative motion in all directions) which can redirect the harmful rotational motion otherwise transferred to the head