Jaimie Tani 5 When I opened the box, I was disappointed to see what was basically packaging material dressed up in Christmasy patterns. I have a large window right above my bed that gets very cold and feels drafty despite not seeming to have any cracks, so while I had very low expectations, I put this foam board in between the glass and the lace curtains/drapes. I haven't taped it down at all, just put it flat against the glass and let the weight of the drapes keep it in place - but it has cut down dramatically on how cold the window feels! I'm honestly amazed at how simple but effective it is. I was using a rolled up blanket to block the draft, but now I can return it to regular use as a blanket. Glad I bought this, may buy it again for another window in the house!