For better protection in any vehicle. Adding a tether reduces the possibility of serious head and neck injuries, which can cause lifelong disability or death. For extra protection in a vehicle with a small passenger space. For more secure installation if the safety belt does not hold the child's car seat tightly in place. Two kits are needed The tether strap kit sold by the car seat maker.
Most tethers are easy to attach.
The tether anchor kit sold by the vehicle dealer. Use the kits made specifically for your car seat and vehicle. Tether anchors are easy to install yourself in many vehicles. Most vehicles have tether anchor kits available. Some tether kits are free, and some dealers install them without charge.