Ergodyne® N-Ferno® Black knit cap featuring 3M™ Thinsulate™ 40 g flex insulation is made from 100% dralon acrylic shell for durability.Ergodyne® N-Ferno® Black knit cap features soft fleece liner that offers snug fit and good appeal. Knit cap featuring acrylic construction finds applications in construction, oil/gas refining, cold storage/warehousing and material handling.