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Oura Ring 5 (top) and Oura Ring 4 (bottom). You can see the small but distinct size difference between the rose gold smart rings.

When you got a chunky smart ring around your finger, size matters. Oura unveiled its super-slim Oura Ring 5 in late May, and it's visibly smaller and lighter than the Oura Ring 4 the smart ring company unveiled two years ago.

Also: Oura Ring 5 vs. Oura Ring 4: I compared the smart rings for health tracking - and it's very close