We've tested a ton of fitness trackers at Tom's Guide, and the Oura Ring 4 is the best smart ring yet. It gives you a slim and sleek alternative to bulky smartwatches, letting you track your sleep, exercise, recovery and more from your finger. Thanks to Black Friday deals, you can scoop up one for a heck of a discount.

Right now you can grab the silver and black versions of the Oura Ring 4 for just $249 on Amazon. That's $100 off and the lowest price ever for this smart ring. Here's what we like about this wearable and why this deal is totally worth it.

The Oura Ring 4 remains one of the most advanced sleep-tracking wearables you can buy. When it comes to sleep, it records heart rate variability, sleep stages, sleep latency, time in bed and time actually asleep with impressive accuracy.

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