AS SWIMMERS return to their local pools this summer after a very long dry spell, they’ll have their pick of new tracking and timing technology to improve their strokes. From heart-rate sensors that clip onto goggle bands to smart goggles that project a tally of how many laps you’ve swum directly onto the lens, underwater fitness tech is catching up to its aboveground cousins. Much like Fitbits, these new devices relay via companion apps how hard you worked and whether to take it easy or push yourself on your next swim. We tested some of the most intriguing innovations to see what’s helpful and what’s hype before you invest.

To Tally Your Sets, Smartly: Finis Goggles

With these smart goggles, instead of squinting at the clock every 100 meters to see how fast you’re freestyling, you can look off into your peripheral vision to check your lap tally, set time, rest time and more. We found it easy to take in the display, which lives at the corner of the lens, at a glance. Once you pull yourself out of the pool, log into the companion app on your phone to view other statistics related to your workout, from stroke type to kilocalories burned. The app will also let you share your metrics with friends. ($235, finisswim.eu)

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