Plantronics, the makers of our favorite Bluetooth earbuds to date, are back with BackBeat Fit ($130), a pair of wireless sport headphones. Coming in black with either bright green or blue accents, the headphones are outfitted with a band that wraps around the back of the head. Each rubber earbud is designed to funnel audio into the ear canal properly, and includes a stabilizing inner ear ring. Controls on either side let you answer calls or play/pause…
