OURA RING 4 SIZING KIT – The Oura Ring 4 Sizing Kit is the best way to find your perfect fit before purchasing. It includes custom sizers so you and others can accurately determine the correct size.

SIZE BEFORE YOU BUY – Oura Ring 4 uses a unique sizing system that differs from standard ring sizes. Be sure to use the official sizing kit before ordering.

NOT STANDARD SIZING – Sizes for the Oura Ring 4 do not match standard ring measurements. The ring is available in sizes 4–15, with no half sizes.

COMFORT & ACCURACY – A properly fitted ring ensures better comfort and more accurate health tracking data.

CHOOSE A FINGER – The ring can be worn on any finger on either hand. For best results, it is recommended to wear it on the index, middle, or ring finger—specifically the finger you intend to use long-term.