I run about 45 miles per week average and have been searching for the perfect runner's earphones. These are definitely not them. The singular problem with these is that when you twist them and they fit snuggly in your ear, it only stays that way for about 5 minutes. Then, you must reach up and re-adjust the earphones, with a slight twist to get them back into your ear. If you wanted earphones that fit tightly and permanently in your ears during your run, these are miles away from being the right ones. They do sound good, yes. They are durable, yes...but they just do not stay in your ears for any prolonged period of time.
IMPORTANT: I have tested 10 different types of sets in the search for the PERFECT runner's earphones that always stay in your ears, that never need to be re-adjusted and that sound great. The search is over now. They are the Sennheiser PMX70 (they make a newer model, the PMX80). Look no further for the perfect long distance runner's earphones. Buy them, test them out and then come back and write me here about your experience with them. It cost me a lot of time and money to narrow it down to this one set of earphones (Sennheiser PMX70) - now you don't have to waste your own time and money and you can skip right to purchasing the long distance runner's dream earphone. If you purchase and test the Sennheiser PMX70, you will be simply amazed by how it is complete in all of the areas that runner's need/seek in their earphones. Good luck and happy running!