1 of 1 people found the following review helpful
Take some getting used to,
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This review is from: Sennheiser MX685 Sports In-Ear Headphones (Electronics)
I use this headphones for cycling and walking mostly, they started off falling out every step or with any head movement. But once I took some time to set them correctly they are very comfortable, and don't cancel out all the background noise which is good for safety on the bike.