Since these helmets are made of fiberglass, they can withstand temperatures that can't be standard plastic. The fiberglass strips are what give these hats the great thermal protection they enjoy. Skullgard fiberglass helmets are top products for people who work in welding, building construction and shipbuilding industries.These particular helmets come with a fastrac fastrac to ratchet suspension suspension, so you can make quick adjustments and get an optimal fit. The skullgard helmets also meet the requirements of the standard ansi for type i clothing. While they offer exceptional protection from high temperature environments, they can also protect your head from higher impacts. Each skullgard helmet can withstand temperatures that do not exceed 350 degrees fahrenheit. The sleek design of the crown is elegant and functional.