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*Every CUDIS 002 Classic Ring includes a one-year warranty with replacement support for verified product issues upon return.
Add ons
Add one more year of warranty
🚚 Shipping: US 3-5 Days | International 2-4 Weeks.

| Size | Circumference (mm) | Diameter (mm) | US | UK/AUS | ITALY | KR | JP | FR | DE |
|---|---|---|---|---|---|---|---|---|---|
| 6 | 51.9 | 16.5 | 5.5,6 | M | 12 | 12 | 12 | 52 | 16.5 |
| 7 | 54.5 | 17.3 | 6.5,7 | N,O | 13,14.5 | 14,15 | 13,14 | 53,54.5 | 17,17.25 |
| 8 | 57 | 18.1 | 7.5,8 | P,Q | 16,17 | 16,17.5 | 15,16 | 56,57 | 17.75,18 |
| 9 | 59.5 | 18.9 | 8.5,9 | R,S | 18.5,19.75 | 18.75,20 | 17,18 | 58.5,59.5 | 18.5,19 |
| 10 | 62.1 | 19.8 | 9.5,10 | T,T½ | 21,22.25 | 21,22.25 | 19,20 | 61,62.5 | 19.5,20 |
| 11 | 64.6 | 20.6 | 10.5,11 | U½,V½ | 23.5,25 | 24,25.25 | 22,23 | 63.5,65 | 20.25,20.75 |
| 12 | 67.2 | 21.4 | 11.5,12 | X¾,Y | 26,27.5 | 26.25,27.75 | 24,25 | 66,67.5 | 21,21.25 |
| 13 | 69.7 | 22.2 | 12.5,13 | Z,Z+1 | 28.75,30 | 29,30.25 | 26,27 | 67,70 | 21.75,22 |
| 14 | 72.5 | 23.1 | 13.5,14 | Z+3 | 32 | 32 | 28 | 72.5 | 23 |
If you are between sizes, opt for the larger size.
*Don't know which size to choose? Share your finger circumference with a CUDIS advisor for expert help.
[Contact Support: support@cudis.xyz]
1.Use a flexible measuring tape or length of string. Wrap it around the finger you'll wear your ring on - if you're creating a ring stack, consider where on your finger the ring will sit. If using string, mark the point on the string where the ends meet with a pen.
2.Lay the string on a flat surface and use a ruler to measure the length (in inches or millimeters) up to the mark. Compare your measurement to the size chart above to determine your ring size. If you are between sizes, opt for the larger size.

A helpful method if you're surprising someone with a gift or treating yourself.
1.Choose a ring that already fits your finger well.
2.Measure the interior diameter of the ring in millimeters (mm).
3.Use the measurement chart above to match the size of your ring to the closest size in mm. The interior of the ring should align with the outer edge of the circle.

Ring Ordering Guide
Diameter 16.5mm
If you are between sizes, opt for the larger size.
*Don't know which size to choose? Share your finger circumference with a CUDIS advisor for expert help. [Contact Support: support@cudis.xyz]
1.Use a flexible measuring tape or length of string. Wrap it around the finger you'll wear your ring on - if you're creating a ring stack, consider where on your finger the ring will sit. If using string, mark the point on the string where the ends meet with a pen.

2.Lay the string on a flat surface and use a ruler to measure the length (in inches or millimeters) up to the mark. Compare your measurement to the size chart above to determine your ring size. If you are between sizes, opt for the larger size.
A helpful method if you're surprising someone with a gift or treating yourself.
1.Choose a ring that already fits your finger well.
2.Measure the interior diameter of the ring in millimeters (mm).
3.Use the measurement chart above to match the size of your ring to the closest size in mm. The interior of the ring should align with the outer edge of the circle.
If you have any questions, you are always welcome to contact us. We'll get back to you as soon as possible, within 24 hours on weekdays.
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Designed for the Quiet Moments That Matter — Sleep, Recovery & Focus




CUDIS 002 Classic is designed for lightweight all-night wear with minimal distraction, providing continuous sleep and recovery tracking throughout every sleep cycle, so you can monitor your overnight health without interrupting comfort.
Monitor stress and energy trends throughout the day with a recovery ring designed to support productivity and mental clarity.
CUDIS 002 Classic offers a screenless wearable experience designed to reduce distractions and keep you connected to your health data in a calm, unobtrusive way.
At just 3 grams, CUDIS 002 Classic is designed for all-day and all-night wear, making it one of the most comfortable lightweight smart ring options for continuous health tracking.
Sleep Better, Stay Focused, Live Effortlessly With Sleep Tracking & Recovery Insights
Premium Titanium Build
Crafted from lightweight titanium for durability, comfort, and everyday versatility, designed to deliver a more reliable titanium smart ring experience for long-term use.
Ultra-Light Comfort
At just 3 grams, CUDIS 002 Classic is designed for 24/7 continuous wear, staying lightweight and comfortable throughout the day and night. It performs especially well as a sleep tracking ring, delivering consistent overnight comfort and reliable sleep and recovery monitoring without feeling intrusive on your finger.
Smart Health Tracking
This sleep tracker ring helps users track sleep, stress, and recovery patterns in a simple, wearable format designed for everyday health awareness.
No Subscription Required
Everything is included with no monthly fee, making CUDIS 002 Classic a sleep tracking ring and smart ring sleep tracker with full long-term functionality and no recurring subscription costs.
Which Ring is Right for You?
Price
$349.00
Price
$399.00
Color
Color
Design
Refined, minimal form with a quiet presence. Built to blend into daily wear with a clean, timeless profile.
Design
Bold, adaptable look with interchangeable color shells. Built for movement, variation, and high-energy use.
Weight
3g
Weight
3g
Material
Full titanium construction. Smooth, durable, and premium to the touch.
Material
Titanium core with abrasion-resistant silicone outer band. Flexible, impact-tolerant, and suited for training conditions.
FAQs
What is the average shipping time?
2–4 weeks depending on the destination, with delivery in under 2 weeks for Asia and the US.
Can I change my delivery address?
For orders that haven’t shipped yet, please contact us at support@cudis.xyz.
How can I track my order?
After you place your order, we’ll send you a confirmation email with your order details. Once your order ships, you’ll receive a separate shipping confirmation email that includes a tracking link.















