Quick answer
Condom sizes are defined mainly by nominal width (girth), not length. If regular condoms feel loose or slide, choose a snug fit such as MyONE Size 47F or 49G. If they feel tight or leave a red ring, choose a larger width such as MyONE Size 64K. Length matters only for how far the condom unrolls: shorter lengths suit shorter erections, longer lengths suit longer ones.
Width is the fit number that matters most
Nominal width is the flat width of the condom in millimeters, and it determines how snug the condom feels around the shaft. A 49mm condom and a 64mm condom differ by 15mm of flat width, which is a large difference in circumference. Length letters, by contrast, describe how far the condom unrolls. A condom that is too short will not cover the base; one that is too long will bunch at the base. Neither is dangerous if the width is right, but both affect comfort and security.
How to read a condom size chart without guessing
Measure your erect girth with a strip of paper or a tape measure around the thickest part of the shaft. Match that measurement to a nominal width, then choose a length letter that covers your erect length without excessive bunching. If you are between two widths, start with the larger one and size down only if it slips. If you are between two lengths, choose the shorter one only if the longer one bunches more than about an inch.
What changes when you move between sizes
Moving from a standard condom to a snug one usually improves sensitivity and reduces slipping, but it can feel restrictive if you are near the top of that width range. Moving to a larger width reduces tightness and red rings, but a too-wide condom can slip off. Custom fit condoms solve this by letting you combine a width and a length independently, so you are not forced into a single 'small, medium, or large' category.
Trade-offs by size
- Snug (47F, 49G): Snugger width improves sensitivity and reduces slipping, but may feel restrictive if your girth is near the upper end of the range. Choose if standard condoms slide or feel loose.
- Classic snug (51D): Slightly snugger than regular with a shorter 5.2-inch length, which reduces bunching but may not cover longer erections. Choose if you need a shorter length without going extra snug.
- Larger fit (64K): Much wider 64mm width reduces tightness and red rings, but a too-wide condom can slip if your girth is smaller. Choose if standard condoms feel tight or painful.
MyONE options compared
- MyONE® Size 47F My Custom Fit® Condom: MyONE Size 47F has a 47mm nominal width and a 6-inch length letter, described as much snugger and slightly shorter than regular condoms. Best starting point if standard condoms slide or feel baggy and you want a slim, tailored fit.
- MyONE® Size 49G My Custom Fit® Condom: MyONE Size 49G has a 49mm nominal width and a 6.5-inch length letter, designed for a closer, more tailored fit. A middle step between extra snug and standard for people who need slightly more room than 47F.
- MyONE® Size 51D My Custom Fit® Condom: MyONE Size 51D has a 51mm nominal width and a 5.2-inch length letter, slightly snugger than regular condoms. Good choice if you are close to standard width but need a shorter length to avoid bunching.
- MyONE® Size 64K My Custom Fit® Condom: MyONE Size 64K has a 64mm nominal width and an 8-inch length letter, described as much wider but shorter than regular condoms. For anyone who finds standard condoms tight or painful and needs a much wider fit.
Which fit should you choose?
Best for
- People who find standard condoms loose or prone to slipping
- People who need a shorter length to avoid bunching
- People who find standard condoms tight or uncomfortable
Not for
- Anyone who has not measured girth and length first
- People who are happy with the fit and feel of standard condoms
