Product review (5 stars): these vent covers work great at a very low  price!
i've got central a.c. i like my house very cool in the summer.  the problem is the central a.c. makes my kid's room an igloo.  i bought these vent covers to stop the a.c. from getting in to her room. her room is below grade so it always stays cool on its own anyway.  these vent covers work great.  just cut them down to the size of your vent, stick them on and everybody's happy happy happy.  seriously these vent covers work great and i would recommend them to everyone.