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OURA

Oura Ring 4 - Gold - Size 8 - Size Before You Buy

  • Based on 6,653 reviews
Condition: New
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This item's return window has been extended for the holiday season: FREE refund/replacement until Jan 31, 2026

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Availability: In Stock.
Fulfilled by Amazon
Arrives Dec 17 – Dec 25
Order within 7 hours and 36 minutes
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Color: Gold


Size: 8


Features

  • 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 womens 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 youre free to forget its 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 youre 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.

Description

Introducing Oura Ring 4: the latest evolution of the revolutionary smart ring. Oura Ring 4 brings you closer to what matters most — your health. The updated all-titanium design is powered by Smart Sensing, a new sensing platform that doesn’t just measure your biometrics, it adapts to you, providing insights into over 50 health metrics including sleep, readiness, activity, heart health, stress, metabolic health, and women’s health. Oura Ring quietly and comfortably monitors your health and with 5 to 8 days of battery life — you can forget it’s even on. With multi-ring support, change Oura Ring 4 styles as easily as changing your outfit. If you have two or more Oura Ring 4 styles, you can now switch easily between different finishes in the Oura App. Sleeker, smarter and more accurate than ever, Oura Ring 4 is made for you. Oura Ring is FSA/HSA Eligible — we can accept FSA or HSA funds for the following: Oura Ring, additional chargers, and shipping. IMPORTANT: Size yourself with the Oura Ring Sizing Kit before you buy — Oura Rings are not US standard sizing, and finding the right size will result in the best experience possible. With a sizing kit purchase, a credit will automatically be applied to your Oura Ring at checkout.

Special Feature: Activity Tracker, Cycle Tracking, Daily Workout Memory, Lightweight


Battery Capacity: 8


Connectivity Technology: Bluetooth


Wireless Communication Standard: Bluetooth


Battery Cell Composition: Lithium Polymer


GPS: GPS Via Smartphone


Shape: Round


Brand: OURA


Model Name: JZ90


Style: Minimalist


Product Dimensions: 0.87 x 0.87 x 0.28 inches


Item Weight: 6.4 ounces


Item model number: JZ90-54216-08


Batteries: 1 Lithium Polymer batteries required. (included)


Connectivity technologies: Bluetooth


GPS: GPS Via Smartphone


Special features: Activity Tracker, Cycle Tracking, Daily Workout Memory, Lightweight


Other display features: Wireless


Human Interface Input: Buttons


Color: Gold


Whats in the box: Oura Ring 4, Oura Ring 4 Charger, USB Cable, Information Booklet, Quick Start Guide


Manufacturer: Oura


Date First Available: October 3, 2024


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Dec 17 – Dec 25

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

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Top Amazon Reviews

    • The Oura ring is the BEST!!
Color: Silver Size: 9
Review Image by Lauren Lauren
Review Image by Lauren Lauren
I absolutely LOVE my Oura ring. It has exceeded all of my expectations. As someone who previously wore a fitness watch, I say that the ring is much more comfortable, cute, and convenient. I wear it 24/7, including overnight for sleep tracking and rarely notice it there. This is coming from someone who used to take off all my jewelry before going to bed. The only time I take it off is when I am showering and that is when I charge it! The ring is able to go in water though which makes it super convenient for swimming and life with kids.The battery life is phenomenal, meaning I don’t have to constantly worry about charging it. It’s been very accurate for monitoring my cycle as well. You can double it with natural cycles as a very accurate form of natural birth control/cycle monitoring. It’s also surprisingly stylish and sleek. If you want an overall fitness/health tracker, this is the one for you! ... show more
Reviewed in the United States on December 2, 2025 by Lauren Lauren
    • I love it!
Color: Silver Size: 8
I don't like wearing wrist watches, so having a smart ring is PERFECT for me! I love how durable it is, it's easy to clean, and the app that comes with it is GREAT! The tracking on this thing is flawless and it uses light sensors to track my vitals, so it doesn't even feel like a smart device, just a regular ring! It also charges very quickly, so if I'm using the bathroom or taking a shower at home, I just pop it on the charger for 10-15 minutes and it's good for a few days! I only do it daily just to establish a good routine, and I have forgotten before and let the battery get low, but still haven't had the power die on me yet! I can see it being an issue for lifting weights since it's coated in stainless still and a little bulky, but otherwise very comfortable for other forms of exercise! I can also see it being a problem because of the red and green light sensors at night, it might be disruptive to light sleepers in a dark room, but I just keep my hands under my blankets or pillows, and I sleep just fine! It doesn't light up all the time, just periodically throughout the night. If the tiny lights at night might bother you, you can probably put a thick sock or a glove over your hand at night to block the light. I'm personally not inconvenienced by it at night, and I like that I can't feel anything when it checks my vitals (heart rate, blood oxygen, temperature, just to name a few). I wound up subscribing to the app anually because I really liked how easy it was to set up and how thorough its analysis was for my overall health. UPDATE: Recently I noticed the ring was draining too fast between charges and I actually needed to charge it everyday! I reached out to customer service via the app, they asked a few questions, and shipped me another one immediately! It was refurbished, not brand new, but it works like new and I would never have known the difference if they didn't tell me! I keep the old one as a backup just in case since they said I don't need to send it back. I basically haven't stopped wearing the Oura ring since I put it on, and I've used it on long walks, swimming (fully submerged in water), and for general daily activities and it works great! I wash it with soap and water when I wash my hands and take it off to give it an.wxtra good wipe down before popping it on the charger or putting it back on! ... show more
Reviewed in the United States on June 13, 2025 by Allison K
    • Tracks everything and is so easy to use
Color: Gold Size: 9
I finally got my hands on one of these bad boys! I took advantage of the Black Friday 30% off deal since these never go on sale! I’ve been eyeing them for over a year and wanted to pull the trigger! I’m honestly so glad i decided to get one! I love that it tracks my sleep, ovulation, stress, day to day readiness, steps, activity, etc. It’s everything I used to use other apps/watches/trackers for but in an easy, accessible, SMALL gadget. I love that it’s waterproof and I can wear it in the shower, love that i was able to get a gold ring to match my wedding ring and other jewelry i wear as well. You will have to BUY and app to get all the insights the ring has to offer, so keep that in mind. It is an annual or monthly cost of around $65 i believe. In my opinion, it’s worth it. I paid the one time annual fee to get it over with and now i don’t have to think about it. Everything is extremely easy to set up on the app, charge the ring, and set it up. I’ve had the ring a little over a week and the sleep data is my favorite right now. As a mom with a 6 mo and 22 mo, my sleep is LACKING but this helps me make sure i stay on track of it to the best of my ability right now! It lets me know how many hours i slept, my resting/sleeping heart rate, my REM, deep, and light sleep; and how long I was in each stage, tells me my readiness for the next day, etc. The ring does run larger than your normal size. I got a 9 and wear it on my middle finger which would normally be an 8. Keep that in mind. There are kits to try your size prior to buying, an a lot of stores have the try on kits to make sure you order the right size too! All in all, the ring is worth the price in my opinion and I wish i would have gotten it sooner because i love it so much! ... show more
Reviewed in the United States on December 3, 2025 by TheMidsizeMoore

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