yuheng, i see u're amongst the most active ppl. so i think i direct this question to u .
i have a px100 and that's fine and all.

however, i wanna buy earbuds for i wanna use it for jogging etc. i'm getting an MX400, also sennheisers. jogging with these are irritating. coz it keeps slipping out of ur ears.

so where do u get those...rubber things as they use for in ear headphones?
is there an rubber thing for these earbud heaphones?
how much and where can i get em?
thanks