The Oura Ring 5 measures 6.09 mm wide and 2.28 mm thick with a weight range of 2 to 2.69 grams and starts at $399 according to TechCrunch. It is smaller and lighter than the Ring 4, which measures 7.90 mm wide and 2.88 mm thick with a weight range of 3.3 to 5.2 grams. Oura describes the Ring 5 as the world’s smallest smart ring.
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The size reduction represents a modest environmental gain but the $399 price excludes lower-income users from preventive health tools.
“Equity of access and material consumption”
Market competition produces measurable comfort improvements that support personal responsibility for wellness without regulatory intervention.
“Private-sector innovation and user experience”
Smaller size expands individual choice in a voluntary market where consumers compare products on personal criteria.
“Self-ownership and absence of coercion”
All three views accept Oura’s size claims and marketing language while omitting any direct comparison to the Ultrahuman Ring Pro or analysis of subscription costs and data control.
“Missing competitor data and total ownership costs”
Ratings by MBFC