A solid-fuel cooker, such as a barbecue, oven, or smoker for outdoor use, comprising a body enclosing a fuel chamber configured to act as a firebox for combustion of solid fuel, such as wood, charcoal or briquettes. The fuel is supported within the chamber on a fuel support and a cooking zone is spaced above the fuel chamber for receiving food items to be cooked. The body comprises an outer shell forming an exterior housing of the cooker, and an inner shell encompassing the fuel chamber, wherein the inner shell is housed within the outer shell and is spaced from the outer shell to thermally isolate or insulate the fuel chamber from the exterior housing of the cooker.