After reading reviews for these headphones, I was highly anticipating receiving mine. I am a very active person, and use headphones daily when going on runs, lifting in the weight room etc. Sadly, these headphones are only good for running, nothing else. They are incredibly uncomfortable after about 20 minutes of use, and can not be worn when laying back on machines for workouts like bench press, incline, decline, etc. The one redeeming factor that I will say about these headphones is the sound quality; which I believe is majorly attributed to the fact that the construction of the headphones forces the earpieces so far into your ear. Had to return these the next day..

As long as you are not sweating, these headphones are excellent. Great sound (when they are dry). Secure fit. Good looking. BUT they are not sport headphones as advertised because they don't play well with sweat. As a runner, I sweat an average amount, and it just pours into these earpieces.... causing a muffled sound and reduced volume. As far as I can tell, it is caused by sweat forming a film over the metallic surface of the earpieces. To make matters worse, sweat can cause an additional seal between the upper portion of the earpiece and the ear canal, which further worsens the sound and causes occasional popping as the seal repeatedly forms and releases while running.

I'm not a Vulcan... my ears are not unusually shaped... I'm sure many others face this same problem (and indeed some of the reviews prove that).

Come on, Sennheiser engineers, I challenge you to come up with a solution. These headphones are WAY too good to discontinue... but they need to work well with sweat. What if a ridge was cut in the outer earpiece to prevent the water seal from forming... and also if the tiny holes in the metallic part were shaped differently to prevent the formation of the sweat film?

--Still a loyal Sennheiser fan

I've owned these headphones for about 2-3 years now. I researched every set of headphones made knowing that the ones I first bought always fell out of me ears.

I wear these on the treadmill, running outdoors, in the gym doing regular weight work and LOVE them. They've been shoved in my gym bag and are sweated on 5 days a week. They sound as good as they did on day one, never fall out, have not even faded.

When (if) these ever break, I will be buying the same exact style again.