0ur opinion:

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The new Sennheiser Sport Line is the partner for sports. Even when you're going flat out, the headphones guarantee a secure fit and superb wearing comfort. All materials used are extremely robust, long-lived and also sweatand water-resistant. ln keeping with Sennheiser's reputation powerful neodymium magnets ensure a brilliant and detailed sound.

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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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Piece Availability: Usually ships in 24 hours

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Buyer's feedback: - * Great sport headphones ...
I bought these for myself for Christmas last year and have used them for many hours in the gym and several thousand miles on a bicycle. They're the best pair of sport headphones I've ever owned. They stay in the ear and sounding good in all kinds of conditions and temps. I've only lost one of the small rubber pieces (comes with extra everything) and I wasn't even wearing them at the time.. Great for the price.

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Buyer's feedback: - Great for running
Once I realized there was an R and L to these, they fit perfectly and worked great for my half-marathon a few weeks ago. I never adjusted them once and they did not hurt my ears. Sound is decent.

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Buyer's feedback: - * Great exercise headphone & more ...
First off, some clarification.
If you look at the pics associated with this item... the man is not inserting the headphones in the ear correctly. He is twisting them posteriorly (backwards) so that they wedge into the ear to stay secure. They are designed to twist anteriorly (forward) so that the little "wheel" at the top of the earbud fits under the little flap that your ear makes as it attaches to your head.
If you insert them correctly... this makes them almost impossible to shake loose. In addition, the headphones come with multiple sizes of "wheels" to customize your fit. Also, there are multiple earbud speaker attachments to fit your ear-hole (as well as a set of cushioned covers).

These headphones are great for many applications. I use them while running and lifting. I even use them at sporting events, since they make a good seal and keep a lot of the crowd noise out and allow me to hear the radio broadcast.
The coiled wire can be a bit of a bother, but really is not a "deal breaker".
Overall, I would buy these again... actually I am buying some for family members this Christmas.

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Buyer's feedback: - Poor ergonomics
The earphone buds are too large and consequently cause pain after about 15 minutes, even when using the smaller fitting ring. The twist-to-fit is okayish, though it causes pain after a while, as the length of the twist-to-fit portion is fixed and may not match with your ear.

NOT recommended unless you have really large ears. May sound stupid, but that's the way it is.

Sound quality is good. But you dont care about sound quality if your ears hurt.

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Buyer's feedback: - * Good sound but annoying curling wires ...
Sennheiser MX75 Twist-To-Fit In-Ear Stereo Sport Headphones
I bought the Sennheiser MX75 twist-to-fit headphones and have been mostly pleased with the purchase.

PRO: The twist-to-fit design fits my ear perfectly and allows me to hear better sound at a lower volume because it stays in place. I walk at a brisk pace and it stays in place without falling out, unlike other headphones I have owned. I have worn the earphones for as long as 1 1/2 hours at one time and they continued to be comfortable. However, my ears were not sweaty, which may make it less comfortable after a while as some reviews noted.

CON: I gave it 4 stars rather than 5 because, like many others who left reviews, I hate the curling wires. I prefer straight wires because they do not get twisted around everything they touch. However, I have learned how to store it in a way that lessens this issue. I also find that the wires, at times, have minds of their own and do not always stay where I want it to stay (they sometimes creep up to near my chin, which is annoying). Also, by design, the right wire is longer than the left wire. I personally like the wires to be the same length. The headphones are also not the nicest color (green), which makes it more conspicuous. I cannot comment on how well the wires hold up as I have only had these headphones for 2 weeks. So far, they seem to be made well.

Summary: I think the positives outweigh the negatives. I am still happy with the purchase because of the good sound quality and excellent fit for my ears. It is a good headphone choice if you exercise or use it while doing any sports activity, like brisk walking.