They snap around the seat belt so it doesn't hit your neck or face. They slide up and down the strap for easy adjustment. Sometimes they can detach and fall off the belt, keep this in mind. Because of this unlinking, it would be great if they were colored to make them easier to find. Once adjusted, they stay in place until the seat belt is removed. You can block the automatic belt recoil lock at the top, so the belt has to enter the automatic lock from time to time while this latch is being pulled out. Then the belt can be pulled over the knees. Not great, but the benefit of not getting hit in the face outweighs the time it takes to unlock the Delivery Zone. They are neat, durable, easy to use and I highly recommend them. Two come to order.
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