these were purchased to replace the original 3g ipod headphones. you can't run with these,you can't even eat or drink with them on if they're inserted properly every swallow sounds like its going through your head . running outside they block everything out (hazardous) thr only thing they're good for is blocking out everything on the couch or on a plane. that's not why i bought them.the sound is good but the uses are limited. i'm really disappointed