4F54B - Heavyweight Flame-Retardant Fleece Accessory - Close fitting. Contoured to face and head, fits close to to both but does not constrict. Moves with the wearer for better mobility. Allows for unrestricted movement. Ideal for temps below Heavyweight FR Fleece Accessory - Close Fit Weight - 8.5 oz. Patented blend of Modacrylic & FR Rayon ASTM D6413 Standard No Melt/No Drip Superior AcclimateA(R) Dry Moisture-Wicking Intense Quick Drying Ag47A(R) Anti-Microbial Protection Clean SeamA(R) Next-To-Skin Comfort Durable, Breathable & Won't Shrink 100% USA Made & Berry Compliant!!!