Oulu, Finland · ring · sleep
More wearables
- Apple Watch The world's best-selling watch, with Fitness+ and a closed ring obsession.
- Garmin The GPS watch standard for runners, cyclists and triathletes.
- Fitbit The tracker that got the world counting steps, now part of Google.
- WHOOP Screenless strap that scores your strain, recovery and sleep every day.
- COROS Battery-monster GPS watches favoured by ultrarunners and Kipchoge.
- Polar The Finnish pioneer of heart-rate training since 1977.