I ordered two gusseted down pillows the same day I ordered these covers. I read that covers for down pillows were very important, so I had a Live Chat (I love being able to do this) and the customer rep verified that this was true. So I ordered these, and they are a perfect fit for he pillows (which I'm getting ready to review). I'm going to trust they keep the bed bugs away, but I know for a fact they're protecting my pillows!!