Jobe Compound 4 Person Ski TubeJobe Compound 4 Person Ski Tube The Jobe Compound 4P is a 4 person convertible ski tube that runs with or without its backrest. Ride with the backrest installed for upright seating, or unzip and deflate the backrest for a flat deck same tube, two riding styles. Sixteen handles with neoprene knuckle guards run across the deck so four riders have multiple grip points. A safety chamber adds backup buoyancy, and water drains clear excess water between