ED ring sizing
ED ring size chart: will a FirmTech ring fit?
Last updated: November 2026
FirmTech rings come in one adjustable size that fits up to 5.5 inches (14 cm) of erect girth, which FirmTech says covers 95% of men.
Instead of a multi-size chart, FirmTech uses a single size with a hook-and-latch strap that adjusts to you. That applies to the TechRing, Performance Ring and MaxPR, so the RingMate vibrator fits whichever ring you choose without a separate size.
What size ED ring do I need?
If your erect girth at the base is 5.5 inches (14 cm) or less, a FirmTech ring fits. You do not choose a size; you adjust the strap until the fit is snug but not tight. If it turns out not to fit, FirmTech's 30-day risk-free trial covers you.
FirmTech ring size chart
| Erect girth | FirmTech fit | What to do |
|---|---|---|
| Up to 5.5 in (14 cm) | Fits, one adjustable size | Adjust the strap to a snug, even pressure |
| Over 5.5 in (14 cm) | Outside FirmTech's stated range | Contact FirmTech before ordering |
How to measure erect girth at home
- When erect, wrap a soft tape measure or a piece of string around the base.
- If using string, mark where it meets and measure it against a ruler.
- If the number is 5.5 inches (14 cm) or less, the ring fits.
How to put on a FirmTech ring
- Open the loop and let the testicles drop through it.
- Set both loops: one under the testicles, one around the base of the penis.
- Fine-tune the strap for comfort. It can go on before an erection.
This anatomical, peno-scrotal fit is designed with urologists to spread pressure evenly. Watch how it is worn on FirmTech's site.
Now choose your ringSizing questions
Is there an ED ring size chart for FirmTech rings?
FirmTech does not use a multi-size chart because its rings come in one adjustable size. FirmTech says one size fits 95% of men, up to 5.5 inches (14 cm) of erect girth, and the hook-and-latch design lets you set the tension yourself.
Will a FirmTech ring fit me?
If your erect girth at the base is 5.5 inches (14 cm) or less, FirmTech says the ring fits. That covers about 95% of men according to FirmTech. If it does not fit, the 30-day money-back guarantee lets you return it.
How do I measure for an erection ring?
When erect, wrap a soft tape measure or a piece of string around the base of the penis and read the length. If it is 5.5 inches (14 cm) or less, FirmTech says its rings fit. Measure at the base, where the ring sits.
How do I put on a FirmTech ring?
Unhook the latch and open the loops, place one loop around the base of the penis and the other behind the testicles, then adjust the tension so it is snug but not tight. FirmTech says it takes a few seconds. RingMate then slides onto the ring.
Can I put the ring on before I have an erection?
Yes. FirmTech says the TechRing is designed to go on when you are soft, so you can put it on discreetly ahead of time. The Performance Ring and MaxPR use the same hook-and-latch design, so you can fit them the same way.
Does RingMate fit any cock ring or only FirmTech rings?
FirmTech says RingMate slides onto any FirmTech ring, meaning the TechRing, the Performance Ring and the MaxPR. FirmTech does not state that it fits other brands, so if you own a different ring, contact FirmTech before buying to confirm whether it will work for you.