• Innovative holding system (Twist-to-fit) ensures best possible fit
• Powerful neodymium magnets for detailed sound
• Sweat and water resistant
• Extremely rugged earphones and cable
• Comes with ear adapter set, cable clip and flexible vinyl carrying case

• nv: Model^MX 75 Sport | Product Type^Stereo earphones | EAN No.^4044156008028 | UPC No.^615104112063 | Cat. No.^500635 | Design^Stereo earphoneswith Twist-to-fit system | Transducer Principle^Dynamic | Frequency Response^1821,000 Hz | Impedance^64 Ohms | THD^ 0.1 | SPL^117 dB | Ear Coupling^In-ear | Connecting Cable^1.2 m asymmetrical | Audio Connector^3.5 mm right-angledstereo mini-jack plug | Delivery Includes^Earphones, ear adapter set,cable clip, carrying case | Packaging Design^Reclosable

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. In keeping with Sennheiser's reputation powerful neodymium magnets ensure a brilliant and detailed sound.

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.

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.

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.

I've tried all kinds of earbuds, and these Sennheisers are definitely the best I've found in terms of staying put, even with fairly vigorous activity. Sound is good, too. Unfortunately the design, which helps lock the buds in place, also put a little pressure on the ear, meaning these are not the most comfortable I've ever used, But if you're tired of constantly repositioning earbuds, these may work well for you.

Seemed like a smart design... until I tried it in MY ears. This is the risk of purchasing something you cannot try before you buy. I found the headphones just couldnt sit comfortably in my ears for more than about 20 minutes, albeit a "smart" design that apparently stays firmly in place better than others - I took them out after a short while reverting to my older "in ear" soft type. I'd recommend buyers just be sure they know their ear - which can only be after trying out a few designs, and losing some - then looking at finer features like sound quality etc.

these buds do what they claim though they are not the most comfortable. I also would like the a slightly longer cord. the plastic trim is a bit flimsy and I had to glue a piece back on already.
in the main, I'm satisfied with the sound and with the ability of the buds to stay put in my ears while very active.
amazon's delivery very good as well.