Perhaps you missed my post or are not sure what I meant by foam tips as I myself didn't know what they were a few months back before I got my own.
You can buy these nice foam tips from the brand Comply, or make your own for a cheaper way by cutting up some sleep earplugs.
Basically the comply ones are nice because they have a large variety so you can choose which one fits your IEM then you choose your size, small medium or large, If you are unsure since it's a new type of tip I'd get the medium because it should fit almost any ear the way these work.
Basically you pinch the tips into a small cylinder and insert into your ears, the memory foam will expand to get a perfect fit of your ear canal. I'd say they are almost impossible to fall out on their own, I work out in them all the time even when I play basketball or something when I'm jumping up and down a lot they don't move a centimeter. This also gives the best possible isolation.
Ok I gotcha. The in ear headphones that I had before were real cheap and just had rubber tips so they would fall out easily with any moisture or long-term use. I guess I will have to do some research on good IEM's with a good bass and clear sound.
