4.5 oz NOMEX® IIIA. Button front with lined convertible collar, two chest pockets with button closure and pencil stall in left pocket. One piece, lined cuffs with button closures. Melamine buttons. Available in long sleeve only. Shirt sewn with NOMEX® fiber thread. ATPV 4.6 HRC 1. US & Canada Colors: 615 Tan, 585 Royal Blue, 550 Gulf Blue, 565 Navy.