Abstract: An inflatable boat includes a bottom structure made up of two or more inflated bottom tubes. Each bottom tube extends along the longitudinal axis of the boat from the stern end of the boat to the bow end of the boat. The bottom tubes are arranged side-by-side along at least a portion of their length, and when in an inflated condition, may directly provide a portion of the hull surface for the boat or at least support further components which provide portions of the hull surface. A front end of preferably each bottom tube is raised vertically relative to a back end of the respective bottom tube at the stern of the boat, and the relative size and/or position of the bottom tubes may be selected to define a desirable hull profile for the boat such as a V-shaped hull profile.