







💍 Own your health journey with the ring that works as hard as you do.
The Oura Ring Generation 4 is a sleek, silver smart ring crafted from aerospace-grade titanium, designed for continuous 24/7 wear. It tracks over 30 health metrics including sleep, heart rate, stress, and women’s health indicators with cutting-edge sensors. Featuring a waterproof design and an impressive 8-day battery life, it offers a perfect blend of durability, comfort, and advanced health insights—empowering professionals to optimize wellness without interruption.











| ASIN | B0D9WW6RPJ |
| Amazon Bestseller | #753 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #2 in Activity & Fitness Trackers |
| Batteries | 1 Lithium Polymer batteries required. (included) |
| Color | Silver |
| Connectivity technologies | Bluetooth |
| Customer Reviews | 4.1 4.1 out of 5 stars (6,683) |
| Date First Available | July 16, 2025 |
| GPS | No GPS |
| Human Interface Input | Buttons |
| Item Weight | 180 g |
| Item model number | JZ90-54217-07 |
| Other display features | Wireless |
| Product Dimensions | 2.4 x 2.4 x 0.7 cm; 180 g |
| Special features | Activity Tracker |
| Whats in the box | Oura Ring 8 Charger, USB Cable, Information Booklet, Quick Start Guide |
P**Y
Works great
Thought it would be more chunky but it’s not. Accurately tracks my workout heart rate and sleep
M**I
運動記録用として購入しました。(5ヶ月継続中) 体調の検知は正確で、運動量の計測は概ね信じれる内容でまとまっており、大きな不具合ないので満足してます。 ストレス検知についてだけは、ゲームをしていてもリラックスして動画を見ていてもすぐにストレス判定されがちなので自分の心に従って無視してます。 サイジングキットでサイズ合わせ数日試着した上で購入してますが、本体購入後、浮腫んでいたのが解消されると数日で指が細くなったのかスカスカに落ちそうになったり、現在は装着する指を変えたり運動しすぎないように気をつけてますが 公式サイト的には人差し指に装着を推奨してますが、痩せやすい方は中指でサイズ合わせをお勧めします。
ユ**ウ
Ring 4は、“感覚を数値で裏付けてくれる”デバイス。 HRVベースの回復スコアと日中ストレスの精度が高く、体感とのズレがほとんどありません。 「今日は無理しない」「今日は攻める」――その判断が迷わなくなります。 派手さはないけれど、本気でコンディションを整えたい人には、かなり頼れる存在です。 また、体表温のわずかな変動や安静時心拍の微差まで拾ってくれるため、体調の“崩れる前段階”に気づきやすいのも強み。睡眠スコアそのものより、長期トレンドでの変化確認に価値を感じています。 アプリは情報量が多いものの、深掘りしたい人には十分なデータ解像度があり、数値を根拠に生活を微調整できる設計。感覚論ではなく、コンディション管理をロジカルに行いたい人には納得感のあるデバイスです。 正直なところ、製品自体にはとても満足していますが、サイズに関してはかなり悩ましい経験でした。タイトルにあるのは、正にそこです! サイジングキットを購入し、むくみも考慮して数日間つけ続けたうえで注文しました。しかし実際に届いたリングは、素材や質感の違いもあり、着用感が微妙に異なり、結果的にワンサイズ大きく感じてしまいました。想像以上にブカブカで、やむなく返品することに。 返送料がかかるのは理解できます。ただ、開封済みという理由で返品手数料が半額以上差し引かれる点には、正直納得しづらさが残りました。サイズ確認のためには開封せざるを得ませんし、実際に指にはめなければサイズ違いには気づけないからです。 もちろん衛生面や再販不可の事情があることは理解しています。ただ、それならなおさら、サイジングキットと実物の装着感の差をできるだけなくす工夫や、より精度の高い計測方法を用意してほしいと感じました。 製品が良いだけに、サイズ選びと返品ポリシーの部分がもう少し柔軟であれば、さらに安心して購入できるのに、というのが率直な感想です。 Oura Ring 4はおすすめできますが、Amazonでの購入は強く推奨しません。 まず試着出来る電化製品店や、公式で購入した方が良いです。
E**N
Useless without membership
Ring is useless without paid membership. You only have access to 3 metrics with no details. You will need to pay 100 dollars a year forever to keep access to detailed metrics. i did myself a favour and stopped paying and bought a generic ring. Lesson learned, hopefully this helps
S**Y
買って確かめて良かったです。普通の指輪のサイズとは異なるため、確認してからOura Ringを買うのがお薦め。
K**I
本体は購入する予定の人は必ず購入してテストした方がいい。値段は気になると思うけど、本体割引もついてくる。 指だからサイズミスは取り返しがつかないし、むくみや生活での違和感を購入前に確認出来るから。それと人差し指と中指でテストしたほうがいい。一日中テストして寝起きや運動後など意外と違いがあって自分に合う指が見つかるから。
え**ん
サイジングキットでサイズを試したら、バッチリ合うリングを選べました! 実際に届いたリングは指にぴったりで、つけた瞬間に嬉しくなりました😊 買ってよかった〜!安心してリングを選べるのでおすすめです。
K**様
Oura Ringを始めて購入するので、メーカー側が推奨している人差し指用のサイズを購入し、人差し指に付けましたが、人差し指は失敗でした。 (1)Oura Ringがすぐに指から外れてしまう。特に手を洗ったり、洗い物をしている際、すぐに外れてしまいます。 (2)通常、物をつかむ場合、親指と人差し指が必須です。なので、コップを掴むにも洗うにもガラスとOura Ringがガチガチと当たってしまい、非常に気になります。 従って、中指用のサイズを買いなおす羽目になりました。 購入する場合は、人差し指は避けた方がいいと思います。
R**W
We purchased the Oura Oura Ring 4 as a Christmas gift for our 20-year-old son, and it has quickly become one of his favorite gifts. He’s very interested in understanding his body better, and this ring gives him exactly that without being bulky or distracting. The first thing he commented on was how comfortable and lightweight it is. Unlike a smartwatch, he doesn’t feel the need to take it off during the day or while sleeping, which makes it much easier to wear consistently. The sizing kit was definitely helpful, and once the correct size was selected, the fit was spot on. What really stands out is the amount of data and insight the ring provides. He loves being able to monitor things like sleep patterns, activity levels, recovery, and overall wellness in one place. The app presents everything in a clean, easy-to-understand way, making the information useful instead of overwhelming. It’s more about trends and awareness than obsessing over numbers, which I appreciate. Sleep tracking has probably been his favorite feature so far. He’s been genuinely surprised at how detailed the sleep insights are and has already made small adjustments to his routine based on what the ring is showing him. It’s encouraging to see technology used in a way that promotes better habits rather than distractions. Battery life has been solid, and charging is quick and simple. He also likes that it doesn’t constantly buzz or demand attention—it quietly collects data in the background and lets him check it when he wants. Overall, this was a great gift and feels well worth it for someone interested in health, fitness, and self-awareness. If you’re looking for a wearable that focuses more on wellness and less on screens and notifications, the Oura Ring 4 is an excellent option. Our son absolutely loves it, and it’s something he uses every single day.
V**A
i love my oura ring , its so stylish - literally can make you look drab to dressy and chic.other than good looks - its very efficient ,i can only wear this ting to bed and the app does a fab job at analyzing your sleep parameters.- quality , restfulness, readiness, length (REM, DEEP and many more) love the cycle tracking - tells your your basal body temperature and possible period start dates. has good selection for health tracking and activities . its all in one , all of my family uses it and loves it !
A**R
I've had my aura ring for a little over a month now. I was very hesitant about this purchase. For one it's one of the more expensive options for tracking biometrics on top of that you need to pay a monthly subscription to really use the thing. That being said it is worth every single solitary penny without a doubt. This thing gives you easily comprehensible data on pretty much everything from the very moment I'm typing this to long term trends. Sleep, fitness, vitality, stress, resilience and so much more. It's also a great educational tool providing you with tips and feedback along the way helping you reach your goals to become a healthier and more productive version of yourself. Here's an example of something that surprised me; this ring started reading and warning me of symptoms of illness before I really started feeling sick with the flu. It diligently kept close watch on my vitals and advised appropriately. It's been extraordinarily helpful in balancing effort with recovery so I don't overdue thing and also don't become complacent. I'm still learning new features and aura is still developing new features all of the time. If you're serious about tracking and improving your health and fitness this is the most useful tool I have found in changing my life second only to faith. The investments you can make in yourself having this much data and sound advice at hand is worth far more than the cost of this ring and subscription. If you have fingers you'd be a fool not to purchase this.
E**A
S**Y
Love the Oura ring is not true to normal ring sizes so definitely use a sizing kit! Becomes comfortable as you wear it an get used to it. I feel like it tracks the heart rate and sleep well but maybe a little less accurate on the activity. Super easy to set up and use the app but does come with a subscription charge. Waterproof I do dishes and shower and everything with it on! But does scratch very easy.
Trustpilot
2 months ago
1 month ago