Companion Heavy Duty is the optimal companion for rigorous adventures and challenges. The robust handle and somewhat blunter 27° angel edge give it maximum edge resiliency. The blade is extra thick (3.2 mm) to be able to withstand all kinds of pressure and it's made of carbon steel, which is simple to sharpen. Remember that carbon steel needs maintaining though, so make it a habit to wipe the knife and oil the blade after usage.