Oura Ring 4 - Silver - Size 9 - Size Before You Buy
4.1 | 8,134 ratings
Price: 349
Last update: 02-02-2026
About this item
- SIZE BEFORE YOU BUY - Oura Ring 4 sizes are different from standard ring sizes. Size yourself with the Oura Ring 4 Sizing Kit. For additional details, see “From the manufacturer” section below
- OURA MEMBERSHIP - First month of membership is included with purchase, for new members only. Subscription is 5.99/mo afterwards. Or opt for the annual prepaid option for 69.99. Membership is tied to your account via the Oura App, not your physical ring
- ACCURACY - SMART SENSING - Oura tracks over 50 health metrics, including sleep, activity, stress, heart health, and women’s health metrics. Oura Ring 4 is powered by Smart Sensing, which adapts to you — delivering accurate, continuous data, day and night
- LONG LASTING BATTERY - With up to 8 days of battery life, no screens and no vibrations, Oura Ring 4 allows you to focus on the present. From a workout to a night out — you’re free to forget it’s on. Until you start getting compliments.
- HSA/FSA ELIGIBLE - We can accept HSA or FSA funds for the following: Oura Ring, additional chargers, and shipping.
- DESIGNED FOR 24/7 WEAR - The updated design of the Oura Ring 4 is more comfortable, fits better than ever, and is water resistant. The first all-titanium smart ring combines exceptional durability with a gentle touch, even for sensitive skin.
- SYNC WITH YOUR FAVORITE APPS - Compatible with iOS and Android — Oura seamlessly integrates with over 40 apps including Apple Health, Google Health Connect, Natural Cycles, Flo, Strava, & more.
- LOOKING FOR THE BEST HEALTH TRACKER? - Whether you’re searching for a sleep ring or fitness ring, Oura Ring 4 is for you — this revolutionary smart ring that allows you to discreetly track your sleep, activity, recovery and stress — in style.
Product information
Additional details
| Additional Features | Activity Tracker, Cycle Tracking, Daily Workout Memory, Lightweight |
|---|---|
| GPS Geotagging Functionality | No GPS |
| Band Material Type | Titanium |
| Case Material Type | Titanium |
| Water Resistance Level | Water Resistant |
| Closure Type | Slip On |
| Human Interface Input | Buttons |
| Supported Application | Fitness Tracker |
| Water Resistance Depth | 100 Meters |
| Controller Type | Ring |
| Metrics Measured | Body Temperature, Menstrual Cycle, Sleep Duration, Stress |
Style
| Shape | Round |
|---|---|
| Style Name | Minimalist |
| Color | Silver |
| Band Color | Silver |
Connectivity
| Connectivity Technology | Bluetooth |
|---|---|
| Wireless Compability | Bluetooth |
| Communication Feature | Bluetooth |
Compatibility
| Compatible Devices | Smartphone |
|---|---|
| Compatible Phone Models | Android Devices, iOS Devices |
Memory & Storage
| RAM Memory Installed | 512 KB |
|---|
Warranty & Support
Manufacturer’s warranty can be requested from customer service.Click hereto make a request to customer service.
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Oura Ring 4 - Silver - Size 9 - Size Before You Buy
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Item details
| Brand | OURA |
|---|---|
| Model Name | Oura Ring 4 |
| Target Audience | Unisex Adult |
| Age Range Description | Adult |
| Model Number | JZ90-54217-09 |
| Built-In Media | Oura Ring 4, Oura Ring 4 Charger, USB Cable, Information Booklet, Quick Start Guide |
| Wearable Computer Type | Smart Ring |
| Manufacturer | Oura |
| Customer Reviews | 4.24.2 out of 5 stars(6,554) 4.2 out of 5 stars |
| Best Sellers Rank |
|
| ASIN | B0D9WWB3WX |
| Item Height | 0.7 centimeters |
| Warranty Description | 1 Year Manufacturer |
Battery
| Battery Capacity | 22 |
|---|---|
| Battery Cell Type | Lithium Polymer |
| Battery Average Life | 8 days |
| Battery Charge Time | 80 minutes |
Display
| Display Type | No Display |
|---|
Measurements
| Item Dimensions | 1.02 x 1.02 x 0.28 inches |
|---|
User guide
| Warranty Type | Standard/Full |
|---|---|
| Waterproof Rating | IP68 |
Top reviews from the United States
- MargoIf you’re into tracking your health - this ring is for you !I absolutely LOVE my OURA ring , it gives me great insight into my sleep and heart health as well as keeping track of my activity levels and stress levels , it warns me when it senses something wrong & notifies me , as well as , giving me suggestions on how to improve those said things . All and all I highly recommend getting one for yourself . My ring is silver as it goes better with my skin tone & because it’s cheaper ???? it looks like a normal ring . It fits well , is comfortable , I only take it off to shower or when I’m doing hard work with hands like gardening to prevent it from getting damaged of scratching . The battery lasts a long time, it is very lightweight, pretty self explanatory with set up .
- AnnaBest purchase!I’ve been using the Oura Ring for a few months now and it’s truly impressive. The design is sleek and lightweight — I barely notice it on my finger, even when sleeping. What I love most is the accuracy of the sleep and readiness data. It gives a detailed breakdown of deep sleep, REM, and total rest, helping me adjust my bedtime routine and recovery days.
The app interface is clean and intuitive, and the daily readiness score really motivates me to listen to my body. I also appreciate that it tracks temperature trends and heart rate variability, which gives a deeper understanding of overall health and stress levels.
Battery life is great — I only need to charge it every few days. My only small wish is for a slightly faster charging time and maybe more real-time fitness data during workouts.
Overall, it’s perfect for anyone who wants to improve sleep, recovery, and health awareness without wearing a bulky smartwatch. Totally worth it! - Alexsuper worth it purchase for cycle trackingamazing for tracking your cycle with natural cycles without having to check your basal body temp with a thermometer !! it literally checks your temp all night ! it was super easy to set up, but it does get scratched easily so i wiuld not say that it is super durable. i personally dont think the scratches are that noticible but they are deffinitly are there ! it is really comfortable and you stop even noticing it is there. it looks much better than a smart watch but it is obviously not like a beautiful ring or something ya know its a plain silver looking thick band.
- Josh A.Amazing data collection… but a very steep price and short life.Note: This is a long term review, after owning the ring for 10 months.
It disappoints me to have to give this a 1 star review, because when the ring works, it works. It’s very convenient, accurate, un-intrusive to wear, and gives you a ton of valuable data, especially related to your cardiovascular system.
But, out of the blue about 10 months into my ownership, battery life has cratered, and even when it doesn’t run fully discharged, it has randomly started disconnecting, meaning it’s not harvesting the data that I expect and want it to, and even worse, without full days of data, it won’t build any trends, meaning the limited data it does collect is useless. Reading online it seems I am not the only person experiencing this disappointment.
Oura’s customer service is non existent. I have yet to figure out how to get in contact with a human there. All their customer service is routed through “Finn” their AI assistant.
After trying everything that “Finn” has recommended numerous times, and getting nowhere, it would be an understatement to say I am frustrated. One of “Finn’s” suggestions is to fully wipe the ring and app from your phone and reinstall it, and if that doesn’t work, the implication from the system is that it will then elevate it to a customer service rep. The issue with that is when you do that, a hard reset and reinstall, the record with “Finn” also seems to go with it, so the system will never engage a human, it comes across almost like it’s intentional firewall in their service.
I am coming up on my 1 year membership renewal. I am at the point where I need to decide if I need to make the $72 annual investment again. I would gladly spend that again, but I’m not really looking at a $72 investment. Given my current ring performance, this means buying another ring. Between the membership and a new ring, with taxes, shipping, etc, etc, etc that’s a near $500 investment; and since it only made it 10 months, that really means it’s effectively closer to $600 a year.
Battery powered wearables have a limited life; I went into this understanding that, but, I don’t think that after less than a year of usage, going from ~5 days of battery life and collecting non-stop data to less than 24 hours of life with random crashes is in any way acceptable. Apple or Garmin or Google would have mass recalls or replacements on their hands if their wearables behaved like this.
Good health is priceless. The ring helped me tremendously in my fitness journey. I have lost over 65 lbs with its help. At this point, however, given I have hit and am maintaining my weight goal, and from my current experience as well as based on what I read from others online, I refuse to spend any more money with Oura, simply because of their poor customer service and poor product life.
My final thoughts: the ring makes your fitness journey significantly easier. Data is king when you’re committed to self improvement. For that, I give it 5 stars; but if you buy one, understand that it most likely will not make it to a year without some sort of collection or battery issue. You have to decide for yourself if $500 for 10-ish months of data is a fair price to pay. - PJSGreat ring, but scratches easilyLove the ring and information it gathers. It is very comfortable. The four stars is for the fact that it scratches very easily… I’ve only had it a few days and it has a lot of scratches.
- KatherineApproveThe fit for this worked out well. I used a sizer at Best Buy. This has been very helpful for me to learn more about my sleeping habits. I’ve been able to make adjustments that have really changed my energy levels. It’s also been very validating on days when I feel exhausted and my ring reflect this back to me. The charge for me is about 3 days. I’m tracking so many interesting things like how caffeine impacts my stress, or reading before bed impacts my sleep. I’m getting clear on my menstrual cycle which has been hard due to my autoimmune disease, It’s expensive and I think I’m getting my moneys worth.
- NatalieGreat HSA/FSA investment to monitor your health journey!It provides lots of great data and personalized information based on the data. I use it mainly for tracking sleep. I have found it helpful when it detects a change in my average temperature when I am starting to feel rundown and under the weather. The visual notification gives me the push to try and get better sleep and take care of myself. I am a few months in and while there are small scratches on the ring it doesn’t bother me.
- Tetiana SamoilenkoGreat sizing kit — very accurate and easy to use!This sizing kit was super helpful. All the sizes are clearly marked, and the rings feel very close to the real Oura Ring fit. It took me just a few minutes to try different sizes and choose the perfect one. The material is comfortable, and the sizing feels accurate even when wearing it throughout the day. Definitely recommend getting this kit before ordering the actual ring — it makes the whole process much easier!