Editorial Review:Product Description:twist-on earbud design * includes ear adapter sleeves for a comfortable fit * water- and sweat-resistant * frequency response: 18-21,000Hz * weight: 0.2 oz. *
Amazon.com Product Description:The Sennheiser MX75 Sport Line Stereo Headphones with Twist-to-Fit System combines a flashy neon green profile with a convenient twist-to-fit design that ensures stability while you're out jogging. The two earpieces contain rubber stoppers that press against the outer ear to further enhance stability, and a cable clip is included to hold the headphones to your clothes when they're not in use. Then, you can put them in the included vinyl carrying case for storage. The headphones themselves deliver low-end bass and drum clarity together with crispness in mid-range frequencies, and the overall sound quality is comparable with Sennheiser's studio headphones.
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Customer Reviews
Average Rating:

Rating: 
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Love them!
This is my second pair of these headphones. They lasted about a year (5 days a week use) before I needed to buy new ones. I like the twist and fit action that keeps them in my ears when I run (even if I get really sweaty!) The only thing I didn't like was how flimsy the cord is,(I used the clip and if you slide it too much it will split the casing of the cord.) And the ear buds were a bit hard to get used to in the begining...
Other than those two things I would buy a third pair when these go out!
Rating: 
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Fits nicely, but bad quality
I bought these earbuds to go with my ipod nano. I like the buds...they fit well in the ear and have several different sizes that are interchangable. However, the connection is not very good. A lot of times I will only get sound in one ear, then I will need to fiddle with the connection to get it to play in both ears.
Rating: 
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My workouts are completely different now
I was sick of working out and spending a majority of my time putting my headphones back in or holding onto them so they do not slip out. I went online for the search for new headphones just for working out and I ran across these headphones and bought them based on the reviews. Man, my life of working out is completely better. I no longer have to stop and put my headphones back in or slow down so I can keep them in before they fall out. My workouts are longer and harder now that I don't have to worry about the headphones.
One note is that if I wear them for a long workout my ears are sore for a few minutes but it fades fast and is well worth it.
Enjoy!
Rating: 
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Great Idea, Bad Execution
The Sennheiser MX55 earphones are overall a failed product. The sound quality is mediocre at best. Sometimes the sound will muffle because it can't handle any bass whatsoever and when there's no bass the sound seems so tiny. The sound feels more outside your head than inside, which is not good. As far as the stability of the earphones on your ears, it's only average. I'm a baseball pitcher which requires a lot of long distance jogging. After a game when I'm running poles, I find myself pausing a lot trying to fix them back into my ear. When you run, the wire will bounce off your chest, and because the earphones are not very secure, it won't be long before you have to twist them back in your ear. This is very tedious and after about a week of putting up with it, I stopped using them. The case it comes with is pretty much pointless because it doesn't protect the earphones at all, only the wires. I regret getting these earphones, I would not recommend them to anyone. I got some Philips ear phones that have a plastic piece to wrap around the back of your ear and they work like a charm, the sound quality is average on those but its so nice not having them fall out when exercising. If you're looking for sound quality then get the Skullcandy Smokin' Buds, they're amazingly crisp and the bass is great.
So, whether you're looking for sound quality or exercise phones, the MX55 is not it. Check out something else.
-Glenn
Rating: 
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Best running headphones I have ever seen.
I've spent countless hours researching to find the perfect pair of running headphones. I spent alot of money over the past several years trying to find headphones that do two things, and two things only:
1. Stay on my head
2. Sound decent
I've tried every style out there, from earbuds to over the ear hooks, to behind the head styles. I've tried several different brands of each, every time unable to find a pair that stays on my head. The best so far was a phillips brand over the ear earbud type. They stayed on my ears, but once I would get to 3 or 4 miles on the road, my ears would be sweating so bad they would just pop out. I was constatnly having to fidget with them so I could hear the music.
I just got this pair last week, and reluctantly took them on my Satruday morning 10 miler. One hour and 22 minutes later, THEY STAYED ON MY HEAD!!!! I was amazed that at the end of my workout, I didn't have to mess with my headphones one single time. The sound quality was also great, much better than the phillips I had been using. Not too much treble, just the right amount of base and clear, crips sound.
If you are a runner, these headphones are perfect for you. I can now clean out my drawer of 20 pairs of headphones.