The manufacturer of the RideSafer® Travel Vest, Safe Traffic System Inc., does permit the use of Inflatable Seat Belts with the Ride Safer Travel Vests. The RideSafer comes with a flexible shoulder guide that should allow for the increased size of the seat belt. If you have a previous model of RidSafer (generation 2), please contact us for a replacement shoulder belt guide that will allow for correct fit with the inflatable seat belt. Version 1 vests cannot be retrofitted with the ISB Seat Belt Guide. Read more about inflatable seat belts.