I was careful to follow instructions, but these things have not done the job at all.  I still tuck at least once a day.  At first, I thought it was just the boys monkeying around on the couch.  But, it did the same things w/ adults just sitting on them.  

Really does not work on the pull out.  The instructions wants you to stuff towels to help w/ that.  Towels or not, the cover still slips and needs re-tucked.

I would not recommend them to a friend.