This heavy-duty Skullgard hard hat by MSA is great for heavy industries where elevated temperatures are common. MSA 454664 hats are heat resistant up to 350°F while still retaining their protective qualities. This Skullguard hard hat meets the voluntary standard for low temperature [LT] and features a heavy-duty construction which complies with Type 1 (top impact) requirements of ANSI/ISEA Z89.1-2009 (Class G) standard.