This harness is made to be used in a car seat. The harness has a wider waist band and a quick release flap to accommodate the seatbelt. You can attach your pet in the car seat with just the lap belt part of the seat belt. There is a quick release snap on the harness that allows you to place your pet in the seat, bring the seatbelt across and fasten it in place. Then quick release the snap on the harness and lap it over the lap part of the seatbelt. Then fasten the quick release. Your pet will be secure in the care seat with some mobility but yet secure. These harnesses are also usable in everyday walking. Measures the same as the regular walking harness and also available in the same fabrics. To order the Car SafetyBelt Harness, go to Walking Harnesses for Dogs and Cats. You can see the fabrics and order there. Car SafetyBelt Harness with Quick Release for the Seat Belt Car SafetyBelt Harness Car SafetyBelt Harness