Make sense of your sleep and recovery with the Silver Oura Ring 4, a lightweight titanium smart ring in a classic polished silver finish. Designed for comfortable day-and-night wear, its smooth interior and recessed sensors help track sleep patterns, heart-rate trends, temperature changes and daily movement. It brings together discreet, jewellery-inspired styling and useful wellness insights through the Oura app. Material & finish: Titanium with a glossy silver PVD-coated exterior Design: Smooth titanium interior with recessed sensors for comfortable overnight wear Battery & water resistance: Typically 5–8 days per charge; water-resistant up to 100 m App & sizing: Works with compatible iOS and Android devices; Ring 4-specific sizing recommended; detailed insights require a paid Oura Membership