Built for sports, Bose's Frames Tempo combines quality audio with eye protection. They have a 22mm full-range driver in each temple to deliver sound that's loud enough for cycling at 25mph yet still enables the wearer to hear traffic warnings, and training partners. The frames are crafted from lightweight, flexible TR90, with custom-designed spring hinges, TPE temple tips, and three sizes of nose pads for a secure fit. They also fit under most protective helmets, offer up to 8 hours of battery life, and are sweat-, weather-, scratch-, and shatter-resistant. They ship with dark 12% polycarbonate lenses and can optionally be outfitted with Road Orange, Trail Blue, or Twilight Yellow lenses for optimal performance in different settings.