I lobe these buds. They are by far the best buds I have used in the gym. The amount of sweat and grime that goes through my workouts and they are still going strong. Very durable. Sound has great bass, defined highs and lows.

Gym-friendly earphones have typically been referred to as such because they either stay firmly in place or endure physical abuse without immediately dying. And in the past, Sennheiser has made respectable earbuds for exercise, but a new partnership with Adidas takes workout listening to a new level.

Excellent audio performance with strong bass response; Comfortable fit; Stays in place even during intense workouts; Waterproof, sweat-proof.

Some cable thump when running; Neon yellow color won't appeal to everyone.

I have to say I am disappointed in the sound quality of these headphones. They are tinny & give a poorer sound than my much cheaper JVC ones. They are truly strongly constructed and stay in the ear for sports but that alone is not enough.

Weighing in at just 14g these Sennheiser CX 680i Sports are lightweight and compact. The 1.2 metre cable is super thin but still manages to come with inline controls and microphone built-in, so it's perfect for use with your iPhone as well as your iPod.

I liked these headphones well enough before the right earbud stopped working, but for this kind of money, other factors should be fined tuned. Factors such as: length of the headphone wire (either too long or too short), the heaviness of the volume control (when you run, the weight of the volume...

Used these for lifting, running, and crosstraining for the past 18 months. Was very happy with the sound compared to other sport headphones. Was more than pleased (read relieved) that they actually stayed in my ears during activity once I tested out a few different fitting pieces to find the correct...

Decent sound for the price Stay in ear with the correct fittings Very durable

Might take some personal habit changes to make them work for you Volume control is the weak link in this chain

Amazon Verified Purchase ( What's this? ) I decided to upgrade to the CX680s after using a pair of CX380s for the last 6 months. The 380s were pretty good but didn't always stay in place during my workouts. The good news with the CX680s is the ear fin technology works really well.

Sound quality and fit are as good as advertised really nice feel unfortunately the headphone quality itself is not so good, in my particular case i sometimes the sound cuts off if you touch or shake the connection jack, there's seems to be a connection issue.

Ever since my first iPad, I've been using Apple's traditional white earbuds. When I got the opportunity to take a look at Sennheiser's CX 680i Adidas Sport In-Ear Stereo Headphones, I suddenly realized what I've been missing all these years.

I had the opportunity a few months ago to meet Jeff from Hummingbird Media, and had a great talk with him regarding the Sennheiser brand of headphones. I expressed an interest in checking them out, and was pleasantly surprised by the product.