If you are in the United States, you may still use your Evenflo car seat without the tether if you do not have an anchor available in your vehicle. The tether is an important safety feature on all Evenflo forward-facing harnessed car seats (and additionally in rear-facing mode on the Evenflo Revolve 360). All Evenflo car seats must pass the federal crash test procedure with and without the tether. While we encourage the use of the tether, it is acceptable to install your car seat without the use of this feature if you do not have a tether anchor available to use in your vehicle. Refer to your vehicle owner’s manual for the location of the tether anchor in your vehicle. Older vehicles may not come equipped with tether anchor hardware. Check with your vehicle dealer. Do not use the tether if you do not have a tether anchor in your vehicle. If you are in Canada, tether use is mandatory as part of Canadian law. All consumers must use the tether for forward-facing car seat installations.