Amphibx Fit is the sequel to Amphibx, a two-year-old $80 waterproof armband that was designed to work with iPods and iPhones at a time when equally waterproof microphone-laden earbuds didn’t exist—and iPods weren’t quite as varied in physical size as they are today. H2O subsequently released a smaller, less expensive armband for iPod shuffles and the sixth-generation iPod nano called Amphibx Grip, as well as its first-ever waterproof…
