Originally Posted by sugarstreetcafe
I personally haven't been able to note any difference between double and single (although it seems single partially lined is easiest to put on my twins' hair).
I think the singles are slightly less expensive. I would have thought that the double would stay in the hair better but I did notice on a recent Group Buy (on the sales board) that most, if not all, were buying singles.
And you are absolutely correct, it is harder to slide the bottom half of the clip through hair if its lined.