Oura Ring 5 — World's Smallest Smart Ring | Health & Sleep Tracker

The most powerful health tracker you'll never notice you're wearing. The Oura Ring 5 packs world-class biometric sensors into the world's smallest smart ring — tracking your sleep, heart rate, activity, and recovery with clinical-grade precision, 24/7.

• Size Before You Buy: Oura Ring 5 sizing differs from standard ring sizes and Oura Ring 4. Order the free Sizing Kit first to confirm your perfect fit before purchasing.
• Available in Sizes 6–13: No half sizes. Fits all fingers on either hand — for best accuracy, wear on your index, middle, or ring finger.
• Comfort Meets Accuracy: A properly fitted Oura Ring 5 sits securely at the base of your finger without rotating during daily activity. We recommend wearing the sizer for at least 24 hours to confirm your ideal size.
• Always-On Health Intelligence: Continuous heart rate, SpO2, skin temperature, and sleep stage tracking — all from a ring so light you'll forget it's there.
• Premium Finishes: Available in Black, Silver, Brushed Silver, Gold, Deep Rose, and Stealth to match your style.

Sizes 6–13. Sizing Kit available separately. No half sizes.