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 E CSA Z94.1-05