What should I know about forward-facing installation and the top tether requirement?

When installing the Graco Slimfit 3-in-1 in forward-facing harness mode (for children 26.5-65 lb), position the harness straps at or above your child's shoulders and always use the top tether for secure installation. The top tether must be used every time the car seat is installed forward-facing with the harness.