I run . I sweat . I be not be pay by Philips corporate headquarters to write this review . I too have spend somewhere in the hundred try to find that perfect , do not slide out of my ear after a mile , with good sound quality headphone . well sadly enough , these be not it . the sound be embarrassing -lrb- which be not why I buy they -rrb- , the headphone start to slide as soon as you be ready to run some distance , and you might be think : how do a pair of headphone slide when they be ear clip on ? low and behold , this set have manage to do so . and once they have start to slip , it be over ... it be all over . in my experience , there be no way to get they comfortably back on , even if you have dry they . the sound be even worse than before if I even bother to dry they mid-run , they wont fit snug again in my ear if they have to be take off mid-run , and they have this ridiculously long cord , long enough to hang myself out of frustration . I always know Philips make crap electronics , but I be willing to try anything , I have about ten or fifteen pair and they be all lame . the best pair I have have , have be a Sony pair , that be not even sport edition , or waterproof , or anything -lrb- they be however expensive -rrb- . if you be consider buy this product , I would keep look , there be better choice out there , although more expensive ... consider what you will spend on this pair and then another pair , and spend about that amount to begin with . or just by a pair of cheapo Skull candy headphone , they be about as sport friendly as these . good luck . sorry philip , I have to tell the truth .