NSA PBI High Heat Wing Thumb GloveNSA PBI High Heat Wing Thumb Glove The NSA PBI High Heat Wing Thumb Glove brings together the unmatched thermal stability of PBI (Polybenzimidazole) fiber with an ergonomic wing thumb design delivering extreme heat protection without sacrificing the dexterity you need on the job. Built for professionals who work in the most demanding high heat environments, this glove is engineered to perform where others fail. Key Features PBI Fiber Construction