Sennheiser CX 300 with Ipod

[t5000]

I just upgraded to the Sennheiser CX 300's for better sound compared to the stock ear buds my Ipod came with. My problem is I only use it for running but they keep falling out of my ears even with the largest ear buds they come with. The manufacturer was no help whatsoever, he told me to by another one of their models for running, Has anyone else had this problem and what did you do to fix it, thanks.

[feh1325]

try the other sizes and see if you can get a good seal around the opening of your canal

[t5000]

I tried them and there even worse than the largest ones. I was wondering if another similar type earbud would fit the Sennheisers and stay in my ears better.

[kpax]

you can custom make the tip from a bit of foam, just cut out a piece and drill a hole in the foam similar size to the earbud.

[t5000]

Do you recommend a specific type of foam to do this?

[feh1325]

its very hard to do this, i ruined my foamies trying to make my own

use earplugs, the kind that people should be wearing at concerts
http://www.hostelz.com/packing/earplugs.jpg

[kpax]

yes the above works well too.