https://www.amazon.com/gp/product/B0BS8J55D4/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

Here is the link to the skin I used. All I did was cut along the line. They fit great, stay on pretty well without any adhesive and make the controller feel more comfortable. The back buttons are also left completely open. I know a lot of folks think that the controller is a bit too small and this goes a little way toward making it feel larger in the hand. The downside is you cannot keep them on if you would like to use the charging dock, but they come on and off easily enough. I would like to mod the dock to make it fit, but I have not worked up the courage to try sanding it. This skin also comes with some really excellent thumbstick domes. These are not sold separately and I like them better than any of the super textured ones that come in the other Play Vital kits. For the money, I highly recommend this mod if you are not really committed to using the dock and are looking to drastically improve the comfort and feel of the Ultimate.