The fly jacket has a detachable liner inside. The fabric, which is camouflage, is by Halley Stevensons, a Scottish company which specialises in waterproofing fabrics by using oil or wax treatment. The pattern is a variation of the nato camouflage. The fabrics qualities are not compromised by the process of making the jacket waterproof this is achieved by a cold wax press. The liner fits in the jacket perfectly for extra warmth but is still fully functional without the liner.