What a great product these pads are! I'd wish to get them earlier! It would save a lot of time spent on pumping. As my baby start to sleep longer over night, I was happy but my breast not at all. After one superlongsleep night finished with mastitis so I was looking for something what could help. And these pads did the job! They keep warm for a long time. As minimum 20min. I use them now with every pumping session, as they reduce time what is very helpful especially at night! They are easy to use, easy to clean. Perfect!