The Top Tether Explained: Why It Matters and How to Use It

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The top tether is a strap at the top back of a forward-facing car seat that hooks to a tether anchor in the vehicle. It reduces how far a child's head moves forward in a crash. Studies and safety organizations stress using it for every forward-facing harnessed seat, whether installed with LATCH or seat belt.

How the top tether helps

In a frontal crash, a forward-facing seat pivots forward around its lower attachment. The top tether holds the top of the seat back, limiting how far the seat and the child's head travel forward. Reducing head excursion reduces the risk of head and neck injuries.

Finding the tether anchor

Tether anchors are usually on the back of the vehicle seat, the rear shelf in sedans, the floor, or the ceiling in some vans and SUVs. They're often marked with a tether anchor symbol. Check your vehicle manual; don't confuse cargo hooks with tether anchors.

Installing the tether

1. Install the seat with LATCH or seat belt per the manual.
2. Route the tether over the vehicle seat back, under or around the head restraint as the vehicle manual directs.
3. Hook it to the correct anchor.
4. Remove slack by tightening the strap until it's snug.

Rear-facing and tethers

Most U.S. rear-facing seats don't use the top tether, but some models allow or require it. Follow your seat's manual.

Common mistakes

• Not using the tether at all.
• Attaching to a cargo hook instead of a tether anchor.
• Leaving the tether loose.
• Routing incorrectly around head restraints.

See common installation mistakes.

Older vehicles

Older vehicles may not have tether anchors. Some manufacturers offer retrofit kits. See car seats in older vehicles.

How much difference does it make?

Crash testing has shown that using the top tether significantly reduces how far a forward-facing child's head moves in a frontal crash. Less head movement means less chance of the head striking the front seat, door or other parts of the vehicle. This is why child passenger safety technicians consider the tether an essential part of every forward-facing harnessed installation.

Tether routing and head restraints

Vehicle manuals specify how to route the tether around adjustable head restraints: some require removing or raising the head restraint, others route the strap under it or between its posts. Incorrect routing can create slack or interfere with the tether's function. In some vehicles with fixed head restraints, a specific route is required. Always check the vehicle manual's child restraint section.

Tether use in pickups and vans

Pickup trucks may use tether loops or webbing routed behind the rear seat, sometimes requiring the tether to pass through one loop and attach to another. Vans and SUVs may have anchors on the floor behind the seat or on the ceiling. Follow the vehicle manual, and ask a CPST if the setup is confusing. See car seats in pickups.

Tethers for boosters

Boosters generally don't use top tethers. Some combination seats use the tether in harness mode but not in booster mode. Store the tether as the manual directs when not in use so it doesn't become a loose object.

Tethers in second and third rows

Not every seating position has a tether anchor. Third rows in some SUVs and minivans have limited anchors. Check your vehicle manual for which positions have tether anchors, and install forward-facing harnessed seats in positions that do. See third-row car seats.

Checking the tether each time

Tethers can loosen over time or be unhooked when someone folds a seat or loads cargo. Make checking the tether part of your routine, especially after cleaning the car or moving seats.

Tether storage when not in use

When a seat is used rear-facing or in booster mode without the tether, store the tether as the manual directs so the hook doesn't become a projectile or damage the vehicle.

Our bottom line

Use the top tether for every forward-facing harnessed installation, find the correct anchor in your vehicle manual, route it correctly and remove slack. It's one of the simplest steps with one of the biggest safety payoffs.

Getting help

If you can't find the tether anchor or aren't sure about routing, a CPST can show you. Many vehicles hide anchors under covers or behind cargo areas.

Tether and seat belt installs

Some parents skip the tether when using a seat belt installation, assuming it's only for LATCH. For forward-facing harnessed seats, use the tether with either installation method unless your manual says otherwise.

Tether use in rideshares and rentals

In unfamiliar vehicles, look for tether anchor symbols on seat backs or the rear shelf, and check the vehicle manual if available. Don't skip the tether just because the vehicle is unfamiliar.

Installation helpers