N3B Los Alamos Canvas Bucket Hat. Off-white canvas hat. Adjustable interior sizing. Chin cord. Side vent holes. Olive green on the underside of the brim. Excellent pre-owned condition. Clean. No known flaws. No fabric information, but it appears to be cotton or a cotton-blend. One size. N3B manages the Los Alamos Legacy Cleanup Contract for the U.S. Department of Energy Environmental Management's Los Alamos Field Office M