Misfit Shine 2 Swimmer's Edition is an activity tracker for the pool
Last year Misfit and Speedo partnered to add swimming features to the Shine fitness tracker. It worked well enough that they are doing it again.
The Misfit Shine 2 is properly waterproof - IP ratings are only about submersion, not the rigors of swimming. They can also track your swim, including the distance (accurate to a meter, Misfit says) and counting your laps. Alternatively, you can set a timer if your exercise program is time-based.
This is in addition to the usual terrestrial activity tracking. You can also use the Speedo Fit app for a more insight into your exercise.
The Misfit Shine 2 Swimmer's Edition will retail for $120, $20 over the regular Shine 2. It will launch in the next two or three weeks.
If you already bought a Shine 2 (or Ray) fitness tracker, you can still get the new features - as a $10 firmware upgrade (available in July). If you're thinking of saving $10 getting a base Shine 2 and upgrading, note that the Swimmer's Edition comes with an extra strap (which accounts for the $10 difference).