QALO - Official Ring Sizing Kit for SR-1 & SR-2 Smart Rings - Sizes 6-13 - Sizing Kit - (2025)

The Oura Ring 5 Sizing Kit allows for you and those around you to find the ideal fit before purchasing. With an Oura Ring 5 Sizing Kit purchase, you will receive a $10 Best Buy gift card to use towards your Oura Ring 5 purchase. A properly fitting Oura Ring 5 will result in the highest possible data accuracy, comfort, and overall experience. Oura Ring 5 sizes are slightly different from standard ring sizes and other Oura Ring generations. It’s important to size yourself and follow sizing instructions. Oura Ring 5 works on all fingers and can be worn on either hand. For optimal accuracy, we recommend wearing on your index, middle, or ring finger.

No screens, no distractions, simply CIRQA Smart Band — the discreet and screenless health and fitness tracker that does not require a subscription. It provides 24/7 health monitoring with health status, Body Battery energy levels and stress through the Garmin Connect app. All device data presented is intended to be a close estimation of metrics tracked. Women’s health tracking provides menstrual cycle tracking by using skin temperature as well as pregnancy tracking. With advanced fitness features, work out smarter with training status and training readiness. Advanced sleep tracking provides sleep score and personalized coaching — even keeping track of sleep stages and naps. Track 80+ activities, such as running, yoga and cycling, by using the on-device activity button or through the Garmin Connect app. The band will automatically detect a variety of activities that can be confirmed or edited in the Garmin Connect App. All this with up to 10 days of battery life.

Meet the QALO Slim Smart Ring, our second-generation smart ring and a slimmer, featherlight way to track your health, fitness, sleep and recovery, with no subscription required. Sizing is important: the QALO Slim Smart Ring uses a unique sizing system that differs from standard jewelry rings and other smart rings, so please use the QALO sizing chart in the product images before you buy. If you are between sizes, size up to account for natural finger swelling and knuckle width. At just 2.2mm thin, it is thinner than the our original Smart Ring and built to disappear on your finger, with up to 5 days of battery on a single charge. Upgraded sensors track heart rate, heart rate variability (HRV), blood oxygen (SpO2), stress, skin temperature, sleep stages, steps, calories, distance and workouts, while women’s health tracking provides insights across every cycle phase. Everything comes together in the free, secure QALO app for iOS and Android, because better health shouldn’t be a luxury. In the box: QALO Slim Smart Ring, charging case, USB-C charging cord, plus black and white silicone ring covers that add comfort, help protect the ring from everyday scratches and let you switch up your look.