Sleep Wearable Form Factor
Compare smart rings, fitness bands, and smartwatches for overnight sleep tracking: comfort, battery habits, and sleep metric depth.
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The OURA Ring 4 Ceramic is a smart ring made of zirconia ceramic. The description says it resists scratches and does not fade over time, and is slightly thicker than the standard Ring 4 without stating a thickness measurement. It analyzes sleep phases, breathing, heart-rate variability, and skin temperature. The description says it has the same sensors, battery, and measurement accuracy as the standard Oura Ring 4. The Oura app presents metrics and recommendations and allows switching between Ring 4 and Ceramic without complicated setup. Color information is unresolved: the model text identifies Cloud, while the color parameter says beige.
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