The Sennheiser CX 680 Sports -- also available in an Apple compatible version with inline microphone and remote as the Sennheiser CX 680i Sports (*Est. $80) -- earn reviewer praise as workout-friendly earphones. Made in association with Adidas, the CX 680/680i are sweat- and waterproof, and don't fall out easily -- thanks in part to unique, comfortable fins that protrude from each earpiece to tuck under the ridges of the outer ear. Sound quality doesn't compare with high-end earphones, though, and users add that highs may be overly bright at the expense of bass for some listeners. For more impressive sound quality, according to reviewers, the more expensive Klipsch Image S5i Rugged (*Est. $130) earphones are a better choice. Users also grumble about the weird cable, which is too short without the included extension but includes a nondetachable volume controller that can get in the way of vigorous activity.
The Sennheiser CX 680 Sports earphones get a balanced, positive review at PCMag.com. The Wall Street Journal includes the CX 680 in a survey of five good headphones suitable for teens. Amazon.com has a good selection of user reviews.
PCMag.com gives the Sennheiser CX 680 Sports earphones an Editors' Choice award. Tim Gideon praises the audio performance, especially the earphones' bass response. He adds that these earphones are comfortable and fit securely, though the cord is susceptible to cable thump.
Review: Sennheiser CX 680 Sports, Tim Gideon, Feb. 4, 2010
2. The Wall Street Journal
Michael Hsu briefly evaluates five headphones suitable for teens (i.e., under $100, good bass response, good sound quality and noise isolating). He's impressed with the Sennheiser CX 680i Sports' sound quality "that rivals earbuds twice its price."
Review: Sounds like Teen Spirit, Michael Hsu, May 7, 2011
Nearly 100 owners comment at Amazon.com on the Sennheiser CX 680 Sports and opinions are decidedly mixed. Some find that the sweat from exercise can loosen fit and compromise sound quality. The cable extension also has an annoying volume controller that can't be removed and can get in the way of vigorous exercise.