Foam tips didn't last for me.
When i ordered the Between 3ANC, they came with free memory foam eartips. I wore them when cleaning the 1st use. The right eartip was weird. I couldn't get a "great sound". I adjusted it some then, decided to take it out. The dang foam tip was still in my ear! I don't remember how many months have gone by. I Only use the left now. We'll, as of yesterday, the left foam tip has come loose. I now have to use my Bose ear buds that goes dead in half the time as my Between 3 ANC. I don't know where my original ear tips are to replace the eartips. I'm gonna throw a tantrum after I hit submit.