Abstract: A harness safety system for securing a child or mentally or physically impaired adult to a shopping cart seat or basket, stroller, high chair, child sporting seat, wheelchair, or similar seating devices in order to safely and reliably keep the child or mentally or physically impaired adult in a seated position. The harness of the safety system includes an improved chest strap design, front and rear shoulder straps, sliding yoke assembly, and a pair of attachment rings. The safety system further comprises a pair of side restraining assemblies having means for adjustment and for safely and reliably securing the harness to an element of a shopping cart seat or basket, stroller, high chair, child sporting seat, or similar seating devices.