Oura Ring 4

Continuous recovery, rendered in titanium.

A fully titanium smart ring with recessed Smart Sensing LEDs that measure sleep, HRV, blood oxygen, and temperature trends around the clock. Up to 8 days of battery life with no screen and no vibration — designed to be forgotten on the finger.

Scientific Rationale

Recovery quality, measured through overnight HRV and temperature, is a leading predictor of next-day readiness and long-term cardiovascular resilience.

Daily Protocol

Wear 24/7. Review the Oura readiness score each morning and calibrate training intensity to recovery state.

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