Over the years I've tried a fair number of wireless Bluetooth sports headphones and I've yet to come across one that's truly outstanding. Whether it's their performance or design, each model, even the best ones, tend to have some sort of niggling issue that keeps them from being universally appealing (with a product that involves the shape of your ears, it's hard to please everyone).
Plantronics BackBeat Fit, which comes in blue or lime green, may fall short of being outstanding, but it is better than most wireless sports headphones on the market. Also, it's pretty well priced so long as you find some added value in the inclusion of a reversible and reflective armband that secures your smartphone and doubles as a case for the headphones.
Design and features
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The buds are connected with a flexible band and the whole package is sweat-proof. For me anyway, they fit securely and I though they were comfortable to wear after I fiddled around with the angle of the tip. True, anytime you have a headphone that you stick in your ear, it's not going to end up being a perfect fit for everyone. But Plantronics seems to have learned from its experience creating previous BackBeat wireless sports models, including the BackBeat 903+.
One key difference with these BackBeat Fit headphones is that they're lighter than Plantronics' previous sports models, weighing in at 24 grams (0.85 ounce). While they're not quite as light as the BackBeat Go 2s, at times, you kind of forget you're wearing them. I say "kind of" because if you're jogging, the cord connecting the earpiece can end up bouncing up and down a bit. With the Jaybirds, you can adjust the cord length, though the system for doing so is pretty kludgy. There's no cord adjustment with this model, though you could take a small rubber band and pinch the cord together to shorten it.
The cord movement bothered editor Dan Graziano, a fairly accomplished high-school long-distance runner, more than it did me. However, my primary concern when testing these types of headphones is making sure that they fit securely and comfortably while I'm running and I thought the Fits stood up well against the competition in that regard.
As far as extra features go, the armband/carrying case is the most notable item (as far as armbands go, it's quite decent, and should accommodate most non-phablet smartphones). The headphone can connect with up to eight devices through Bluetooth, and also doubles as a wireless headset thanks to a built-in microphone (call quality was good).