A towable non-powered nautical device for aquatic leisure sport is lifted at the front when pulled, or towed, and is sometimes altogether lifted out of the water. The nautical device can carry one or more persons and includes a front inflatable structure equipped in its lower part with a towing attachment, at least one inflatable elongated secondary stucture, at least an inflatable elongated auxiliary structure, retainers for passengers who are standing, seated, lying down, or positioned astride on the secondary structure, on each side of a flexible lateral skirt.