Skip Navigation

Sennheiser and adidas worked together to create these lightweight, sporty headphones to help your workouts go more smoothly. Sennheiser's high-quality drivers produce clear sound with high-energy bass, and are housed in moisture-resistant earbud casings. The exclusive "EarFin" design keeps the earbuds comfortably and securely in place just inside your ear, even during a hard workout.

The MX 680s come with a range of ear sleeves and EarFin adapters to help ensure a comfortable fit. A control dial built into the headphone cord lets you adjust the volume of your tunes without having to fumble with your player. And a cable clip keeps the cord out of your way, while the carrying pouch stores your earbuds until your next workout.

Product Highlights:

  • moisture-resistant construction
  • EarFin design holds the earbuds in place just inside the ear
  • includes multiple earbud sleeves and EarFin adapters for a comfortable fit
  • in-line volume control
  • frequency response: 18-20,000 Hz
  • impedance: 16 ohms
  • 2-foot Kevlar®-reinforced cable with right-angle stereo mini plug, plus 2-foot extension cable
  • compatible with adidas miCoach, iPhone®, and all iPods® and MP3 players with a headphone minijack
  • includes carrying pouch and clothing clip
  • weight: 0.42 oz.
  • warranty: 2 years
  • Our 60-day money-back guarantee

Sennheiser/adidas® MX 680 Reviews

Average Customer Review:

4 Reviews


Written by: maryte from Austin, TX on May 16, 2012

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Comfort
  • Noise Reduction
  • Sound Quality

These are horrifying. I got them to use with my iPod while working out in the gym (elliptical, recumbent, treadmill) and 1) I cannot fit them in my ears (regardless of the cushion size used) without them falling out and 2) they are so large and hard that they cause distressing pain - and this has nothing to do with the volume of the music I play! The sound is probably adequate, but I can't really tell because they fit so badly. Worst money I have ever spent on headphones.

Pros: None that I'm aware of

Cons: Poor fit, painful design

Sennheiser/adidas® MX 680

Written by: sara from La Marque, TX on March 6, 2012

Crutchfield Customer Review (What's this?)

great sound, very comfortable, works with all my sound systems



Sennheiser/adidas® MX 680

Written by: MarkY from Stafford, VA on May 5, 2011

Crutchfield Customer Review (What's this?)

Good sound quality. The variable earpieces take some fiddling with to find the
right combination. My only real complaint would be that the main cord is too
short. The extension with the volume control is too heavy, it causes the
earpieces to become dislodged during a run. The clips aren't of much use in
this area. I had to unplug the extension and clip my iPod shuffle to my collar
during a recent 5K. Would prefer a lighter extension maybe without the volume
control. Really like the sweat resistance of the earpieces - that's been an
issue with other ear-buds. Overall, I'm satisfied. Good value and with a spiffy
yellow color too!



Sennheiser/adidas® MX 680

Written by: john from nyc on March 3, 2011

Crutchfield Customer Review (What's this?)

great headphones for working out,good sound



Hands-on research

What's in the box?

Download owner's manual

  • In-ear headphones (with attached 24" cable terminated by a 3.5mm connector) In-line volume control (with attached 24" cable terminated by a right-angle 3.5mm connector)
  • 1 Pair of foam ear-pads
  • 4 Pair of silicone ear-tips (S/M/L/XL)
  • 3 Pair of silicone ear-hooks (S/M/L)
  • 1 Pair of silicone housing-rings
  • Shirt-clip
  • Storage pouch
  • Instruction Manual (Eng/Fre/Spa)

Features and Specs

Fit Style In-ear/Earbud
Earcup Type Closed
Bluetooth No
Frequency Response 18-20k Hz
Sensitivity 118 dB
Impedance 16 Ohms
Weight 0.42 ounces
Cord Length 24"
Airline Adapter Included No
iPod Control No
Volume Control Yes
Built-in Microphone No
Parts Warranty 2 Years
Labor Warranty 2 Years

Product Research


Sports Design: The Sennheiser Adidas MX680 sweat-proof, in-ear headphones deliver outstanding, high-energy stereo sound during your workout.

Sweat & Water Resistant: The MX680 headphones utilize sweat-proof, water-resistant construction for indoor and outdoor use during any season.

Earfin Stability: The EarFin stability system provides a comfortable, secure fit that won't fall out during your workout.

Interchangeable Ear-tips: The MX680 sports headphones come supplied with 4 pair of ear-tips (S/M/L/XL) to fit your ear. These silicone ear-tips provide a secure fit in-the-outer-ear that stays put without using your hands.

Kevlar Reinforced Cable: The DuPont Kevlar reinforced cable guarantees durability and flexibility, even in cold temperatures. The headphone cable features a gold-plated, right-angle 3.5mm connector.

In-Line Volume Control: The Sennheiser MX680 sports headphones feature an in-line volume control to adjust the level of your music on the go.

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.