Oura smart rings are up to 30 percent off for Black Friday

Oura is hosting a Black Friday sale on many of its more popular smart rings. Perhaps the most notable deal is for the Oura Ring 4, which is down to $249. This is a discount of 29 percent, as it typically costs $349. The sale applies to the black colorway.

The Ring 4 actually topped our list of the best smart rings, and with good reason. It's comfortable to wear for long periods of time, which is always nice. It's a visually striking ring. We also appreciated the size options, as it fits fingers from size 4 to 15.

As for functionality, this smart ring tracks a number of health and fitness metrics. The affiliated app will send out notifications when it thinks you need a rest or to remind you to exercise. It keeps an eye on sleep, heart rate, stress, body temperature, menstrual cycle and a whole lot more. The battery lasts around a week, which is always nice when taking a quick vacation.

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The only downside here, and this applies to all Oura rings, is that many features are locked behind a subscription paywall. This costs $6 a month or $70 per year.

The company is also selling the gold version of the Ring 4 for $349, which is a discount of $50. The water-resistant Stealth Oura Ring 4 is down to $299, which is a discount of $100.