The top tether is an important part of many child-restraint installations in Australia, but it is also one of the components parents can find confusing.

It may look like a simple strap, but it forms part of the restraint’s complete installation system. It must be connected to the correct vehicle anchorage and adjusted according to the instructions supplied with both the child restraint and the vehicle.

Here is what parents and caregivers need to know.

What Is a Top Tether?

A top tether is a strap attached to the upper section of a child restraint. It connects the restraint to a designated child-restraint anchorage point in the vehicle.

The tether works together with the restraint’s approved installation method, such as the vehicle seatbelt or ISOFIX-compatible lower attachments.

It does not replace the seatbelt or lower attachment system. Each component has its own role within the complete installation.

Why Is the Top Tether Important?

The top tether helps control the movement of the child restraint during sudden braking or an accident.

For the restraint to perform as designed, the tether must be:

• Connected to the correct anchorage point
• Routed according to the instructions
• Free from twists
• Adjusted to the required tension
• Used in combination with the restraint’s approved installation method

A tether that is disconnected, incorrectly routed or attached to the wrong point may prevent the restraint from functioning as intended.

Do All Car Seats Use a Top Tether?

Top-tether requirements vary between restraint types and models.

Many Australian child restraints require a top tether, including rearward-facing and forward-facing restraints. Some booster seats may also require one.

Never assume that a restraint does or does not need a top tether based only on its appearance or age category. Check the instruction manual for the specific model.

If the restraint is supplied with a top tether and the instructions require it to be used, it must be installed as directed.

Is a Top Tether the Same as ISOFIX?

No. The top tether and ISOFIX-compatible lower attachments are different parts of the installation.

ISOFIX-compatible attachments connect the lower section of an approved restraint to the vehicle’s ISOFIX low anchorages.

The top tether connects the upper section of the restraint to a separate anchorage point elsewhere in the vehicle.

Using ISOFIX-compatible lower attachments does not mean the top tether can be ignored. If the restraint’s instructions require the tether, it must still be connected and adjusted correctly.

Where Is the Top-Tether Anchorage Point?

The anchorage location varies between vehicles and seating positions.

Depending on the vehicle, it may be located:

• On the parcel shelf behind the rear seat
• On the back of the vehicle seat
• On the floor of the luggage area
• In the roof area behind the seating position
• Behind a removable cover or marked panel

Refer to the vehicle owner’s manual to identify the correct child-restraint anchorage for the seating position being used.

Is a Luggage Hook a Top-Tether Anchorage?

Not necessarily.

Vehicles can contain hooks, loops and mounting points intended for luggage, cargo or other purposes. These should not be assumed to be child-restraint anchorages.

Look for the child-restraint anchorage symbol and confirm the location in the vehicle owner’s manual.

Attaching a tether to an unapproved point may prevent the restraint from performing as intended.

How Should the Top Tether Be Routed?

The correct tether path depends on the child restraint, vehicle and seating position.

It may need to pass over or around the vehicle headrest before connecting to the anchorage. Some vehicle headrests can be adjusted or removed, while others cannot.

Always follow the child-restraint instructions and vehicle owner’s manual. Do not create an alternative path because it appears shorter or more convenient.

The tether should also remain clear of:

• Twists and knots
• Sharp edges
• Hinges or moving vehicle parts
• Luggage or cargo that could interfere with it
• Any position not permitted by the instructions

How Tight Should the Top Tether Be?

The tether should be adjusted according to the child-restraint instructions.

Remove the required slack so the tether is correctly tensioned, but do not continue tightening beyond the manufacturer’s directions.

The tether should not be used to compensate for a loose or incorrect seatbelt or ISOFIX-compatible installation. The restraint’s primary installation must also be completed correctly.

What Is a Tether Extension Strap?

Some vehicle and restraint combinations may require an approved extension strap to reach the designated anchorage point.

Only use an extension strap that is permitted for the restraint and installed according to the instructions.

Do not:

• Tie multiple straps together
• Use rope, cord or a general-purpose strap
• Modify the original tether
• Use an extension simply because it makes the installation easier
• Use an accessory that has not been approved for the application

If you are unsure whether an extension is required, contact the restraint manufacturer or an authorised fitter.

Common Top-Tether Mistakes

Common issues can include:

• Forgetting to connect the tether
• Connecting it to a luggage or cargo hook
• Using the wrong anchorage for the selected seat
• Leaving excessive slack
• Twisting the tether strap
• Routing it incorrectly around a headrest
• Allowing luggage to interfere with the strap
• Using an unapproved extension
• Assuming ISOFIX-compatible installation removes the need for a tether
• Moving the restraint to another vehicle without checking the new anchorage location

These mistakes can be difficult to identify if the restraint has not been checked against both manuals.

What Is InfaSecure’s Single-Sided Top Tether?

Some restraints introduce features intended to make daily access and installation more manageable.

InfaSecure Pilot includes a patent-pending Single-Sided Top Tether designed to provide more practical access to the child from one side of the restraint.

The tether must still be connected to the correct vehicle anchorage, routed correctly and adjusted according to the Pilot instructions.

The feature changes how families interact with the tether, but it does not remove the need for correct installation.

Check the Tether Regularly

A tether should not be treated as something that only needs attention on the day the restraint is installed.

Check it regularly and whenever:

• The restraint has been moved
• The vehicle seat has been adjusted or folded
• Luggage has been placed near the tether
• Another person has used the vehicle
• The restraint appears to have shifted
• The tether has been disconnected for any reason

Before travelling, confirm that it remains connected, correctly routed, untwisted and adjusted as instructed.

When Should You Ask for Help?

Ask the manufacturer or an authorised child-restraint fitter for assistance if:

• You cannot locate the correct anchorage
• The tether does not appear to reach
• You are unsure how it should pass around the headrest
• The vehicle handbook and restraint instructions appear unclear
• The seating position has an unusual design
• The tether repeatedly loosens or slips
• You are not confident that the installation is correct

An authorised fitting station can also help check the complete installation. Correctly fitting and using a restraint is just as important as choosing an appropriate restraint.

The Most Important Rule

Always follow the instructions for the specific child restraint and vehicle.

Top-tether designs and vehicle anchorage locations can vary, so general advice should never replace the product manual or vehicle owner’s manual.

If you have questions about an InfaSecure restraint, contact InfaGroup Customer Care with the product model and vehicle details for product-specific guidance.