Oura Ring 4 uses PVD-coated non-allergenic titanium and is water resistant up to 100m (328 ft). It weighs 3.3 to 5.2g depending on ring size, with dimensions of 7.90mm width and 2.88mm thickness. Its thickness makes it noticeably chunky, and wearing it on the middle or ring finger can cause painful pinching during firm handshakes. Oura recommends wearing it on the index finger with the notch facing the palm for best sensing. Because ring diameter cannot be adjusted like a watch band, sizing should be tested across activities and hydration changes using a sizing kit before ordering.
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