Measure twice, order once
Size guide
The right length and ring make all the difference to comfort. It takes two minutes with a soft tape measure, or a strip of paper and a ruler.
Your recommendation appears here.
Measure using the steps below, then enter both numbers to see a suggested cage length and starting ring. Every kit includes all 4 ring sizes.
Cage length
Starting ring
How to
measure
Measure when you're relaxed, ideally in a warm room. Take each measurement twice.
Measure soft
Measure when fully soft and relaxed, not after a hot shower or exercise. Cold can make you smaller, so a normal room is best.
Length
Lay a ruler along the top, from the base to the tip, without pressing in. Round to the nearest half centimetre.
Base circumference
Wrap a soft tape, or a strip of paper you then measure, all the way around the base where the ring will sit. Keep it snug, not tight.
Size
chart
Inside measurements of each cage. Your size finder result is highlighted.
| Cage length | Inside length | Inside diameter | Suits a soft length of |
|---|---|---|---|
| Nub | 5 cm | 3.2 cm | 4.5 to 5.4 cm |
| Nano | 6 cm | 3.7 cm | 5.5 to 6.9 cm |
| Small | 7.5 cm | 3.7 cm | 7 to 7.9 cm |
| Standard | 8.5 cm | 3.7 cm | 8 to 8.4 cm |
| Large | 9 cm | 4 cm | 8.5 to 10.5 cm |
Base rings included in every kit
Ring sizes are inside diameters. Under each ring is the base circumference it suits.
Checking
your fit
Signs of a good fit
- The ring sits snugly without pinching or marking the skin
- Colour and temperature stay normal
- The cage rests close to the body without pressing
- You can wear it for an hour with no discomfort
Stop and adjust if
- You feel pain, numbness or tingling
- You notice swelling or a change in skin colour
- The ring leaves deep marks: try the next ring size up
- It slips off easily: try the next ring size down
Sizing
questions
What if I'm between two lengths?
Choose the shorter one if you want it to feel secure, or the longer one if you plan to wear it for long stretches.
Which ring should I start with?
Start with the ring the size finder suggests. If it pinches or leaves deep marks, go up a size. If it slides off easily, go down a size. All four rings are in the kit.
Can I swap my cage for a different length?
For hygiene reasons we don't accept change-of-mind returns, so please measure before you order. See our refund policy for details.
Is this guide medical advice?
No. It's general sizing help. Build up wear time slowly, and if you have a medical condition, check with a doctor before use.