I got a pack of the Kombi tips from Bob to try and report back. They are very similar to the old Sony Hybrid Isolation tips (the stuffed ones) with a piece of foam stuffed inside the silicone tip. For me, it improves isolation a little more than just the tip, and it does not affect the sound signature nearly as much as comply (which I do not like using at all for that reason). I had the large, and they fit very similar to the Sony Hybrid tips I use regularly (look very similar too). I feel like the biggest trade off with the tips, for my anatomy, was just a slight reduction in soundstage. Otherwise I didn't notice any significant change in sound signature compared to just the silicone, which is a good thing.
With some use (a few days) I noticed they did not attach to my iem stem as strongly, and one tip actually fell off the iem when in use, leaving the tip in my ear. I am sure this is an isolated incident, but it happened so I thought I should mention it.
Overall, if you are looking for a bit more isolation than a typical silicone tip gives, and don't like foam for whatever reason, I recommend trying out the Kombi tips by Trinity!