I received an Oura Ring 5 as a gift, but after wearing it for a week, I realized that it didn't give me anything new compared to my Apple Watch, and I don't want to track two different apps. But the size and weight are amazing, so this would be great for someone who prefers a tracker that doesn't sit on the wrist.
It's a size 8 in brushed silver. Here's what the brushed silver looks like: https://ouraring.com/store/rings/oura-ring-5/brushed-silver
If you're unsure about your size, some Costcos in the area have a sizing kit you can try.
It retails for $500 + tax, but I'm asking $225 for it. It comes with a charger, and still includes the original 1-year warranty / protection plan.