
Sizing
Riffculture Ring Size Chart
| Size | Inner Diameter (mm) |
Perimeter (mm) |
|---|---|---|
| #7 | 17.5mm | 55mm |
| #8 | 18.3mm | 57.5mm |
| #9 | 19.1mm | 60mm |
| #10 | 20mm | 62.8mm |
| #11 | 20.8mm | 65.4mm |
| #12 | 21.6mm | 67.8mm |
| #13 | 22.4mm | 70.4mm |
How to measure your size
STEP 1:
Take a long non-elastic rope or paper, and wrap it around your finger.
STEP 2:
Make the rope or paper fit closely to your finger. Avoid being too loose or too tight.
STEP 3:
Mark the junction point on the rope or paper.
STEP 4:
Lay the rope or paper flat, then measure the length. Measure multiple times for accuracy.
You wear the ring.
The app listens.
Kira responds.
The ring captures over 8 key health signals and the app turns those readings into clear, easy to understand insights. You see patterns in your recovery, energy, stress, and sleep without needing to decode anything.
And then, Kira, your AI health coach, watches for any changes in your vitals, spots early warning signs, and sends you gentle, helpful recommendations. No searching. No guessing. Kira already knows what matters and what to do next.
Technical Specs
2.55mm thick, 7.8mm wide, 3 grams
Sizes: US 6–14
Fully Waterproof
Withstands daily use in the shower, pool, or rain.
Battery: 7 Days
8 days Power Mode, 5 days Performance Mode.
Charging: 30 mins via wireless charger
ECG, PPG, temp sensor, 3x accelerometer
Bluetooth Low Energy, Airplane Mode
iOS & Android compatible
GDPR & HIPAA compliant
Titanium body, hypoallergenic interior
Finished with a durable PVD coating protecting it from scratches and wear.