Lightweight protection against bumps and minor head injuries Durable polypropylene will not break or crack Innovative "trim-to-fit" feature for fit in any hat Skullerz Universal Bump Cap Insert is a lightweight, impact-resistant shell that inserts into any baseball cap, hat or other headwear for additional head protection. It helps protect against bumps, scrapes, bruises and other minor head injuries. Many hats vary in shapes and sizes, but the flexible horizontal and vertical sides of the shell allow it to fit both a variety of hats/caps and head shapes. The trim-to-fit customization makes it easy and convenient to fit into many types of hats, caps and headwear. The insert is made of lightweight, durable polypropylene and designed with maximum ventilation to provide continuous airflow for breathability but won't compromise protection. It features a foam pad inside for additional impact protection and comfort against the head. It's not bulky like a hard hat and is ideal for mechanics, airline baggage handlers as well as workers in warehouses, factories, in-home services and other industries that do not require safety hard hat protection but work in areas with low beams, pipes, passageways or other low hanging obstructions. (n/a) Color Gray Hardware Color Family Gray Material Polyethylene Number of Suspension Points 4 Point Protective Equipment Features No Additional Features Returnable 90-Day Size One Size Fits All Suspension Type Non-Ratcheted Vented or Non-Vented Vented Certifications and Listings No Certifications or Listings Manufacturer Warranty We stand behind everything we make and guarantee our products to be free of defects in materials and workmanship to the original purchaser for the lifetime of the product. That said, damage, abuse, and/or normal wear are not covered. (Don't lawyers bring you down?)