Wanted to throw in my thanks to NewZealandMatt for the clever idea, even though in the end I went with the foams fix instead. I am one of those people with ears that are just slightly too big, so when I first put AirPods in they sound great but as soon as I move around at all or even smile, they slip just enough to make the bass fade out. Experimented with the tape in different spots and was a massive improvement, but found that it just delayed the eventual slippage instead of preventing it. It is possible that I just hadn't found the perfect tape placement, but I had also ordered these foam covers from Amazon and once they arrived I did what a reviewer on Amazon recommended and used a bent out paperclip and a lighter to make a little hole where the sensor is (I only needed to make one hole on each, the other sensor stays clear most of the time) and that has solved this for me. They now sound great, lots of bass all the time, and they still fit in the case. They even seem a bit more comfy in my ears. At first I wasn't sure I would be keeping the AirPods as constantly readjusting them was annoying. Now I'm keeping them. BeyondTheTech: Cutting the foams will make them fall apart. Heat melts the fibers together a bit I think, so they are still pretty stable where the hole is made. You should try it out since you already have some. Obviously do it while the foams are not on the AirPods. I put a pair on the pods and made a mark where the sensor is, then took those off and used them as a guide and made holes in several pairs so that I have some ready if I need to replace the ones I have on now.