https://www.amazon.com/dp/B098SMGF36?psc=1

I tried these on a suggestion from this subreddit, and the ones with the flanges (the "Silicone Black" named version) really make a HUGE difference in how the Buds 2 stay in my ears. With the original ear tips, large size, they stayed in OK if I made sure my ears were very clean first, but even then, any movement of my jaw/mouth would cause them to move outward slightly and become looser.

With these flanged ones, that issue is about 95% solved and they virtually do not budge even if I do those kinds of movements. Highly recommended to try if you're having this issue, especially for the price. I tried the mixed size ones and the large works for me.