Exactly how and why what Novella said but no extension straps - still tossing up whether to buy them or have the actual seat belt buckle strap extended. My big girls could do up their own seat belts but with the seats being so close its too tricky for them - I have to pull the door side seat over a bit to get my hand in to do up the middle seat, then then door seat and then shove the door seat back over again. Major pain in the whatsit. How I long for a muppet bus . . .