Have to say that having tried several so called 'training specific' headphones, by phillips, jvc, sennheiser etc.., these are by far the most comfortable, secure, and most definitely the best sounding..I really cannot fault them. Great bass, definition and clarity is now totally available whilst putting the miles in, and they also, as a bonus, cut out external noise by being naturally isolating(diff. size rubber ear fitments). All in all, worth the extra money over cheaper sport model cans..Enjoy!!