A "harness seat" refers to a seat in a vehicle that has a safety harness attached to it. It is designed to keep passengers secure and protected during travel. Full definition
A 5 point harness seat belt system is essentially the must for safety and stability for both you and kids. (omgstroller.com)
First, it is an extended 5 point forward facing harness seat for children up to 65 pounds that features an easy to install system with a lock off buckle for easy secure installation. (pocketyourdollars.com)
A five or at least three - point harness seat belt is necessary to keep your baby safe during jogging. (getyourreview.com)