The Evolution Deluxe 6161 Full Brim Hard Hat is a true evolution of the long established MK2 and MK3 hard hats. It's shell is made of High Density Polyethylene (HDPE) and has many useful features. It comes with a 6-Point suspension system with polyester textile straps. The Chamlon sweatband has an Egyptian cotton core with porous PU coating for maximum sweat absorption, which is PH neutral and dermatologically tested. The full brim provides additional protection to the beck and ears against sun, glare, rain, snow and falling debris. It also comes with a wheel ratchet which is the new easy way to create a firm comfort fit. Hat Size: 6 5/8 - 8 (20 7/8" - 25")