Pyramex Ridgeline Features: -The Ridgeline hard hat is the ultimate combination of high performance impact protection and exceptional personalized comfort. -Made from ABS material this thermoplastic resin is a lightweight material that combines strength and rigidity. -Low profile design offers a low center of gravity for better balance. -Rear padded suspension provides additional level of comfort on the wearers' neck. -Vented pressure pad keeps the straps in place providing an additional level of comfort. -Easy to grasp triangle knob adjusts the suspension from 6.5 to 8 inch hat sizes. -Swinging hinge points allows you to find the most comfortable position on the back of your head. -Meets ANSI Z89.1-2009 Standards, Type I, Class C, G, and ECSA Z94.1-05 -4 point pivoting ratchet suspension.