Unfortunately the headrest strap does not fit the 2006 Hummer H3 headrest, the headrest does not loosen or tighten like most. You could add another 3-4 inches to the strap. Due to the fact that the belt isn't sufficiently adjustable, it doesn't sit properly on the seat, making it seem a bit short where the base of the car seat is. Bags are also a great idea, but they're tiny.
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