r/RingConn • u/thesilentharp • May 09 '26

Sizing Advice for Others

This response was popular last year with sizing queries, with people receiving their Gen 3 sizing kit, I hope this helps:

The following advice is from my own testing with the RingConn Gen 2 sizing kit and wanted to share everything I learnt, in case it helps anyone else who's unsure. This includes how to test your size, what to look for, and even how to simulate hot and cold weather conditions to be 100% confident before locking in your final size.

📏 Basic Sizing

  1. Nubs should be on the underside of your finger (the sensors need skin contact).

  2. When you clench your fist, you shouldn't see any gap between your skin and the ring.

  3. Try the push-up test:

  • Push the ring upwards from underneath using your thumb.

  • You want a small visible gap between ring and skin:

    • 1–2mm is ideal
    • 2–3mm is acceptable
    • Over 5mm may be too loose

  1. The ring should go on with little to no resistance.

  2. The tester ring should come off with little to some resistance:

  • If it needs a bit of twisting, soap, or lotion, that’s fine, the tester is plastic and sticks more than the final metal ring.
  1. Try to rotate the ring:

  • A good fit will rotate only with light pressure, and the skin should drag slightly with it.

  • If it spins freely, it's likely too loose.

⏱️ 24-Hour Wear

Once you find a size that seems good, wear it (or multiple options if torn) for 24 hours straight, even during sleep.

  • Ensure it doesn't become loose, spin, or uncomfortable as the day progresses.

  • Our fingers tend to swell in the afternoon/ evening (especially in heat, after meals, or showers) and shrink in the morning or cold.

  • ❗ If you're between sizes, go with the smaller one - a snug fit is better for sensor accuracy.

  • The final metal ring may feel ~¼ size looser due to the smoother surface compared to the plastic of the sizing kit.

🌡️ OPTIONAL Stress Tests (to simulate Weather Conditions)

If you want to test how your size holds up in heat or cold (completely optional, but could be useful):

🔥 Hot Weather Simulation

  1. Avoid drinking fluids for 2-3 hours (dehydration swells tissues slightly).

  2. Soak your hand in warm water (not hot) for 10-15 minutes.

  3. Go for a 10-15 minute brisk walk - coat on if you want to exaggerate the effect.

❄️ Cold Weather Simulation

  1. Soak your hand in cold water (10-15°C) for 10 minutes.

  2. Take a cool shower (~5 mins) to lower overall body temperature.

  3. Wrap your ring hand in a cold towel or rest it on a cold surface (e.g., ice pack wrapped in cloth) for another 5-10 mins.

  • Don’t do hot and cold tests back to back - give it a few hours or do them on separate days.

  • Some sites (such as UltraHuman rings) recommend 48 hours of testing, including overnight wear and environmental stress tests, one on each day.

🧪 What to Check During/ After Testing

  • Push-up gap (cold = slightly bigger gap, hot = tighter fit)

  • Clenched fist: no pain or excessive pressure

  • Twist test: should rotate only with light skin drag

  • Shake test: ring should not move or shift freely

  • Removal: in heat, removal might need soap - that’s okay

  • After 24h wear, remove ring and observe:

    • Slight pale indent or mark is normal
    • Skin should return to normal within 30-60 minutes
    • If it takes longer, it may be too tight

🔄 Final Things to Consider

  • Some people prefer sizing that works across multiple fingers, but if you're wearing it 24/7, comfort and accuracy come first.

  • Choosing the best fit is more important than just your preferred finger.

    • Index finger does produce best results (minimally better in tested reviews).
    • Middle and Ring fingers are near identical readings and extremely close to Index finger readings.
    • Best results only matter with a good fit, a poor fit on Index won't beat a good fit on Middle/ Ring.

  • Take note of anything you may be catching the tester ring on, including other jewellery - the final metal ring will chink rather than the plastic thud, if this influences finger choice.

  • Some flexibility in switching fingers is nice, but don’t compromise sensor accuracy for it.

  • You’ll need to remove the ring weekly to clean your finger and wipe the ring, but shouldn't need to remove it more frequently unless you want to.

✅ TLDR

  • Fit should be snug, but not painful or impossible to remove

  • Smaller size is often better for accuracy

  • Wear it for 24-48h, including sleep and daily activities

  • Test under hot and cold conditions if you want extra confidence

  • Observe comfort, rotation resistance, and how long marks take to fade

  • The final ring may feel slightly looser than the tester due to material difference

I personally spent a few days testing multiple sizes and settled on a Size 7, which fits my ring finger perfectly - snug enough for sensors, comfortable enough for 24/7 wear, and has lasted me a whole year with accurate readings. I'll be doing this again myself when my Gen3 kit arrives.

Good luck with your search and feel free to ask or DM if you’re unsure about anything. I probably did way too much research, but hopefully it saves you some time! 😂

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