Features:

• 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

Editor Reviews:

Product Description:
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.

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.

Rating : - Decent earbuds
These have pretty good sound, but do not block out much other sound. The twist to fit system is a little fiddly. I am still not sure that I am doing it right, but it works pretty well.