Abstract: A float tube has a pair of separate side-by-side pontoons, each comprising a pontoon cover and an inflatable bladder. A generally U-shaped support, having a separate cover and bladder, is mounted on top of the pontoons. The support has a pair of arms which overlay portions of the pontoons and the cover of each arm is attached to one of the pontoon covers. The support also has a back support member which spans between the two arms. The back support member serves to interconnect the two pontoons and maintain the proper spacing between them, and be a back support for someone sitting in the float tube. A flexible seat extends between the two pontoons in front of the back support and a rigid separation element extends between the two pontoons in front of the seat to keep the pontoons parallel. A headrest, having a separate cover and bladder, is located above the back support member.