Great for run and cycling - the earphone do not budge no matter how much move you do . basic exercise like run and cycling do nothing to shake they . there be a part that go over the ear like a web that be make of soft rubber material which be a key feature for its comfort and prolonged wearability . these be not exactly audiophile earphone , but you get use to they . if you mp3 player have a user adjustable eq then all the better . I have hear better earphone , but these be pretty good . clearly some compromise have be make , but they seem to have come out on the good side of acceptable . they do not rest flatly in the cavum concha , brace by the tragus and antitragus , as with standard fontopoid style phone , but be instead hold in place by the plastic band at a inwardly direct angle . this be a step in the right direction in term of comfort and stayputiveness . it seem that because they sit halfway outside the cavum concha , the phone be make larger for greater efficiency and output to make up for the slightly increase distance from the ear canal . I think they be a little bit too big , but again it take get use to the position as well as the audio range . the yellow wire be a nice aesthetic touch , but the black jacket on both the 1\/8 '' plug feel like they might pull right up the wire when remove they from the player or the volume control . have to be careful with they ... overall they be a very clever design which have in my opinion completely solve the problem of earphone migration . never again will I reach up during a blissful run to shove that fontopoid back into my ear , and I be look forward this summer to take it fully for grant . if the next generation of these headphone have slightly smaller earbud with more exotic sound quality , I 'll promptly wear they .