Suspension: Ratchet Available in various colours High density polyethylene shell. Side slots for attaching accessories. Rain trough to shed rain out. Reinforcing ribs for extra shell strength. Choice of ratchet or pinlock suspension. Vertical adjustable headband and foam perforated vinyl sweatband. Weighs less than 12 oz. Pinlock and ratchet suspensions adjustments. Certified to CSA Z94.1-05 type 1, Class E.