The one number that matters: nominal width
Nominal width is the figure to look at. It is the width of the condom laid flat, measured in millimetres, and it is the standard way condoms are sized in the UK. A smaller nominal width means a tighter, closer fit; a larger one means more room. Length and shape matter too, but width is what decides comfort and how secure a condom feels.
As a rough map: anything around 52–56 mm is a standard or regular fit and suits most people. Below that is a snug fit; above it is a wider fit. You do not need to measure anything to start — the signs below are usually enough.
How to tell if your condom fits
If you are already using condoms, your current one is telling you something. Look for these signs rather than guessing from a number.
Signs it is too tight
- It is a struggle to unroll, or it will not roll all the way down.
- It feels constricting or uncomfortable, or leaves deep marks afterwards.
- It feels thin to the point of straining. A tight condom is under more stress and more likely to tear.
If that sounds familiar, move to a wider fit — a larger nominal width such as 56 or 60 mm.
Signs it is too loose
- It slips during use, moves around, or feels in danger of coming off.
- There is loose, bunched material rather than a close fit.
- It comes off partially or fully when withdrawing.
If that sounds familiar, move to a snugger fit — a smaller nominal width such as 49 mm.
What about length?
Length is rarely the problem. A condom that is a bit long will simply not unroll all the way — the extra stays as a ring at the base, which is fine. Roll it down as far as it will go; a little extra length is not a problem. Width is almost always the thing to adjust first. If a condom is genuinely too short, a wider fit usually comes a touch longer as well — but treat width as the main dial.
EXS and SKYN widths compared
Every condom Johni sells, by nominal width, narrowest to widest. Tap a product for the full specification, including length and thickness.
| Fit | Nominal width | Condom | Material |
|---|---|---|---|
| Snug | 49 mm | EXS Snug Fit | Latex |
| Standard | 53 mm | EXS Nano Thin | Latex |
| Standard | 53 mm | EXS Nano Thin, 48 pack | Latex |
| Standard | 53 mm | SKYN Original | Latex free |
| Standard | 53 mm | SKYN Elite | Latex free |
| Standard | 54 mm | EXS Regular | Latex |
| Standard | 54 mm | EXS Mixed Flavoured, 48 pack | Latex |
| Roomier | 56 mm | EXS Air Thin | Latex |
| Roomier | 56 mm | SKYN Large | Latex free |
| Roomier | 56 mm | EXS Ribbed, Dotted & Flared | Latex |
| Largest | 60 mm | EXS Magnum | Latex |
Widths are the manufacturers' nominal figures. Full specifications, including length, thickness and shape, are on each product page.
Shape and thickness
Beyond width, two things change the feel. Shape is either straight-walled or flared (slightly wider towards the closed end, which some people find more comfortable) — the EXS Regular, Air Thin, Mixed Flavoured and Ribbed lines are flared, the rest are straight. Thickness is separate from fit: a thin condom is not a smaller condom. EXS Air Thin, for example, is one of the thinner options at 0.045 mm but is actually a roomier 56 mm width. If you want thin, see the thin options; if you want fit, follow the width table above.
Latex or latex free?
If you or a partner react to latex, or you just prefer the feel, the SKYN range is latex free (made from polyisoprene) and comes in standard (53 mm) and large (56 mm) widths. Every EXS line is natural rubber latex. The material does not change how you size it — use the same width signs either way.
Still not sure? Try a fit, then settle on it
The quickest way to find your size is to try a standard width, then adjust once based on the signs above. Once you know your fit, a subscription keeps that exact box arriving every one, two or three months, so you are not re-checking or running out. Everything ships in a plain mailer with nothing on the outside but the address.
Common questions
What is nominal width?
It is the width of the condom laid flat, in millimetres — the standard UK sizing measure. Lower numbers are a closer fit, higher numbers give more room. It is the most useful single figure when choosing a size.
Standard condoms feel tight. What should I use?
Move to a wider nominal width. EXS Air Thin and SKYN Large are 56 mm, and EXS Magnum is the widest at 60 mm. A wider condom is easier to unroll and under less strain, which also makes it less likely to tear.
Are bigger condoms just longer?
No. Between sizes, width changes more than length, and width is what you feel. A "large" condom such as EXS Magnum is mainly wider (60 mm), not dramatically longer. Choose on width, not length.
Do thin condoms come in different sizes?
Yes. Thickness and width are separate. EXS Air Thin is thin (0.045 mm) and a roomier 56 mm; EXS Nano Thin is thin and a standard 53 mm. Pick the width that fits, then choose how thin you want it.
Does a better fit really make condoms safer?
Fit affects reliability: too tight and a condom is more likely to break, too loose and it is more likely to slip. Getting the width right reduces both. As with any condom, always read the label and instructions, and no method is completely effective.
More guides
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