Four details to check before choosing a cover
Exact ring
Record brand, generation and the size marked on the ring or packaging.
Outer geometry
Provide outside diameter, body width and side-profile photos. Do not use finger circumference as the sleeve dimension.
Sample fit
Check installation, retention, removal and charger clearance with the physical ring.
Official ring-size ranges are not cover sizes
Use the ring maker’s current sizing information to identify the exact ring, then measure and sample the protector separately. The ranges below refer to the smart ring’s own size system; they do not specify silicone sleeve dimensions or prove that a cover fits.
| Ring model | Official ring-size range | Important distinction |
|---|---|---|
| Oura Ring 5 | 6–13 | Different sizing from Ring 4; use the correct generation kit. |
| Oura Ring 4 | 4–15 | Do not transfer Ring 4 sleeve specs to Ring 5. |
| RingConn Gen 3 | 6–15 | Use a Gen 3 sizing kit; Gen 3 may differ from prior generations. |
| RingConn Gen 2 / Gen 2 Air | 6–14 | RingConn says these generations share a sizing kit; still sample the exact ring and cover. |
| Samsung Galaxy Ring | Confirm your marked ring size | Include the exact product reference and charger; verify the sleeve separately. |
| Ultrahuman Ring AIR | Confirm your AIR ring size | Specify AIR and supply photos or a physical ring for sample approval. |
Sources: Oura Ring 5 and Ring 4 specifications · RingConn size chart and generation guidance. Brand sizing pages can change; recheck them when preparing a new product brief.
A ring sizing kit selects the ring for your finger; it does not certify a third-party protector. Our Oura Ring 5 cover page and RingConn Gen 3 cover page describe the sample inputs.
Oura, Samsung and Ultrahuman: specify the generation
Oura states Ring 5 uses a different sizing system and has different physical dimensions from Ring 4. Keep Ring 5, Ring 4 and Gen3 separate in your product brief. Do not transfer a cover specification from an older generation without checking the physical ring.
For a Samsung Galaxy Ring protector, give the size and exact product reference. Samsung recommends its own sizing process. For Ultrahuman Ring AIR, confirm the AIR model rather than assuming another model shares its dimensions.
These model names identify the rings for which you are requesting a cover. They do not mean that all sizes are in stock or that a universal sleeve has passed testing. The selected sample and written specification define final compatibility.
A practical fit check
Record outer width, outside diameter or circumference, edge shape and the intended sleeve thickness. Include photos of the ring from above and from the side. Physical samples are preferable when dimensions or tolerances are uncertain.
During approval, check that the sleeve can be fitted and removed as intended, stays in position during intended use and leaves the required openings clear. Check the charging arrangement separately. Do not describe a cover as sensor-safe or charging-compatible unless the selected configuration has been verified.
Label the approved combination
Keep a record of ring generation, ring size, sleeve size, color and approved sample revision. Use the same references on your packaging and reorder brief. This reduces confusion between the ring size and the supplier’s sleeve size.
A silicone cover does not make the ring impact-proof or guarantee protection in sport or machinery use. Follow the ring manufacturer’s usage guidance. For wholesale orders, include your use case in the sample request and agree on the checks before production.
Keep ring size and protector size separate.
| Confirm before quoting | What to send | Why it matters |
|---|---|---|
| Ring identity | Brand, generation, marked size and product reference | Keep each model and size as a distinct sample request. |
| Physical fit | Outside dimensions, edge profile and reference photos or ring | Review the sleeve against the actual ring geometry. |
| Approval record | Sample ID, revision, fit and charger checks, date | Use the approved combination for packaging and reorders. |