back to shop
Choose Your Size
I DON'T KNOW MY SIZE
Purchase with Sizing Kit
Purchase with Sizing Kit
7
8
9
10
11
12
13
How does it work?
1
Get your sizing kit delivered to your doorstep just before the ring.
2
To find your best fit, we recommend wearing the sizing ring for 24 hours.
3
Confirm your size by following the instructions located inside your kit.
I KNOW MY SIZE
Pick Your Size
How to know my size?
1
Circular sizes are standard US sizes. Your current ring sizes match your Circular ring sizes!
2
You can easily find your size with the Circular Sizing Guide or with 3D rings that you can print!
6
7
8
9
10
11
12
13
Extra Cable
Add an extra cable for your ring
Extra charger
Add a second charger
Insurance
Priority shipping, support & replacement
14 Day Return Period
Secure Checkout
Worldwide Shipping
Delivery timeline
Sizing kits sent in 2 weeks, rings shipped for December 2023 / January 2024
Features
Heart rate tracking
24/7 heart rate & morning resting heart rate.
Breathing rate
Breathing rate during sleep periods.
Temperature
Temperature variations trends help detect fever, menstrual cycles…
Blood oxygenation
Medical grade SpO2 levels during sleep & rest periods.
HRV
Heart rate variability
One of the most important metrics for wellness and recovery monitoring.
Live measurement
On-demand spot measurement for HR, SpO2, HRV, activity intensities, and Max HR.
Alarm clock
Wakes you up with vibrations. Also with smart alarm during your lightest sleep stage.
24/7 Activity tracking
Automatically tracks your physical activities and provides recommendations for improvement.
Sleep tracking
Automatically monitors your core sleep and naps to give recommendations on how to improve them.
Launch guided breathing exercises through the ring's vibration to relax, sleep better and more.
Timer
Make the ring vibrate after a specified delay.
Airplane mode
Disable all ring's communication.
Recommendations
Personal, insightful and actionnable wellness recommendations to make sense of your data.
Stress
Live stress score feedback and stress predictions based on your activities.
Get notified when you vitals are going off.
Energy monitoring
Get stats and in depth insights about your energy levels.
Heart rate tracking
24/7 heart rate & morning resting heart rate.
Breathing rate
Breathing rate during sleep periods.
Temperature
Temperature variations trends help detect fever, menstrual cycles…
Blood oxygenation
Medical grade SpO2 levels during sleep & rest periods.
HRV
Heart rate variability
One of the most important metrics for wellness and recovery monitoring.
Live measurement
On-demand spot measurement for HR, SpO2, HRV, activity intensities, and Max HR.
Alarm clock
Wakes you up with vibrations. Also with smart alarm during your lightest sleep stage.
24/7 Activity tracking
Automatically tracks your physical activities and provides recommendations for improvement.
Sleep tracking
Automatically monitors your core sleep and naps to give recommendations on how to improve them.
Guided breathing
Launch guided breathing exercises through the ring's vibration to relax, sleep better and more.
Timer
Make the ring vibrate after a specified delay.
Airplane mode
Disable heavy ring's communication.
Recommendations
Personal, insightful and actionnable wellness recommendations to make sense of your data.
Stress
Personal, insightful and actionnable wellness recommendations to make sense of your data.
Vital alers
Get notified when you vitals are going off.
Energy monitoring
Get stats and in depth insights about your energy levels.
What's in the box?
Circular Slim
Charger
Technical specifications
Only 2 grams. Lighter than a standard ring.
Comes with a portable charger.
Up to 5 days of battery life.
Only 2 grams. 30x lighter than a smartwatch.
Comes with a portable charger.
Up to 5 days of battery life.
Android and Apple compatible.
1 year warranty.
Forged in Mordor. Design & Assembled in France.
Android and Apple compatible.
Forged in Mordor. Designed & Assembled in France.
1 year warranty.
Sensors
1 infrared LED sensor
1 red LED sensor
1 green LED sensor
3 axis accelerometer
1 surface temperature sensor
Sensors
1 infrared LED sensor
1 red LED sensor
1 green LED sensor
3 axis accelerometer
1 surface temperature sensor
Active Feedback
A powerful vibration motor
A reactive button (activated with a tap)
Active Feedback
A powerful vibration motor
A reactive button (activated with a tap)
Materials
Exterior: High grade alloy of matte black bead blasted aluminium and carbon fiber
Interior: Medical grade non allergenic, non metallic and comfortable inner material
Materials
Exterior: High grade alloy of stainless steel and carbon fiber with coating
Interior: Medical grade non allergenic, non metallic and comfortable inner material
Weight & Dimensions
Width: 8.8 mm
Thickness: 2.2 mm
Weight: 2 grams
Weight & Dimensions
Width: 8.8 mm
Thickness: 2.2 mm
Weight: 2 grams
Sizing
Available in 8 sizes: From US 6 to US 13
Circular ring sizes fit just like regular rings sizes
You can easily find your size with the Circular Sizing Guide or 3D rings that you can print!
Sizing
Available in 8 sizes: From US 6 to US 13
Circular ring sizes fit just like regular rings sizes
You can easily find your size with the Circular Sizing Guide or 3D rings that you can print!
Water Resistant
Suitable for light water exposure like showering or washing hands
Water Resistant
Suitable for light water exposure like showering or washing hands
Battery & Power
Battery life; Up to 5 days
Full charge in 45 minutes
Battery & Power
Battery life; Up to 5 days
Full charge in 45 minutes
Memory
Up to 20 days of data
Memory
Up to 20 days of data
Connectivity
Bluetooth Smart® (Low Energy)
Airplane mode
Connectivity
Bluetooth Smart® (Low Energy)
Airplane mode
Compatibility
Free app on iOS and Android
Compatible with mobile devices that run iOS 11.0 or later, or Android 6.0 or later.
Compatibility
Free app on iOS and Android
Compatible with mobile devices that run iOS 11.0 or later, or Android 6.0 or later.
You May Also Like
Get an extra charger
