A seatbelt assembly for motor vehicle occupant restraint applications of the three point type in which a lap belt section is formed of two layers of seatbelt webbing. The system may be implemented in connection with single or dual seatbelt retractors. A loop tongue is provided which is releasably affixed to a seatbelt buckle and has at least one slot which allows the free movement of webbing through the tongue between the use and storage conditions of the seatbelt system. An end of the webbing is also attached to the tongue. The system is operated by an occupant in a manner like a conventional three point restraint system using a single releasable attachment. Through the use of a pair of thicknesses of webbing in the lap belt section of the restraint system, control of reduced chest deflection and pelvic excursion may be provided.