Good question. I have found that they do not lock when pulled all the way out and retracted very well. I put my almost two year old in the front seat every once in a while. He really likes it. He says "Defender cool dude". Most cars you can pull the belts all the way out and then they will hold as tight as you need them. I use two motorcycle straps through the car seat for his short trips. I don't understand the seat belts and how they function. I have had trouble teaching myself to wear them.
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