NSA PBI High Heat Level 5 GloveNSA PBI High Heat Level 5 Glove When ordinary heat gloves aren't enough, the NSA PBI High Heat Level 5 Glove steps in. Built with PBI (Polybenzimidazole) fiber one of the most thermally stable materials available this glove is engineered for the most extreme high heat industrial environments where failure is not an option. Key Features PBI Fiber Construction Polybenzimidazole fiber delivers exceptional thermal stability, resisting degradation at