Quick answer

MyONE 64L and 64M share the same 64mm nominal width, so girth is identical. The only difference is length: 64L is 8.5 inches, while 64M is 9.3 inches. Choose 64M if your erect length is 9 inches or longer; choose 64L if you are between 8.5 and 9 inches. If you are shorter than 8.5 inches, neither is ideal—size down in length.

What the 64L and 64M FitCodes actually mean

MyONE uses a two-part FitCode: a girth number and a length letter. The girth number (64) is the nominal width in millimeters, and the length letter (L or M) corresponds to a range of erect lengths. Both 64L and 64M use Girth Number 64, so they are identical in width. The difference is only in the length of the condom itself. 64L is 8.5 inches long, and 64M is 9.3 inches long. That extra 0.8 inches matters if you are near the top of the length range for 64L.

How to measure before you choose

To pick between 64L and 64M, measure your erect length from the base to the tip along the top side. If you measure 8.5 to 9 inches, 64L is designed for you. If you measure 9 inches or more, 64M gives you the extra length so the condom does not feel tight or roll up. Girth measurement is equally important: measure the circumference at the widest point. A 64mm nominal width fits a circumference of roughly 5.5 to 5.8 inches (about 140–148mm). If your girth is smaller, a 64mm condom may feel loose regardless of length.

The trade-off: length vs. snugness

Choosing between 64L and 64M is a trade-off between having enough length and maintaining a snug fit. 64M offers more length, which can reduce the chance of the condom rolling down during use if you are very long. However, if you are closer to 8.5 inches, the extra length of 64M may leave slack at the base, which can feel less secure. 64L provides a more tailored fit for those in the 8.5–9 inch range, but if you are longer, it may feel too short and could slip off. There is no universally better size—only the one that matches your measurements.

Material and feel are identical

Both 64L and 64M are made from the same super soft, vegan latex that is hyperthin and extra lubricated. They are also triple tested for safety. So the decision is purely about length, not texture, thickness, or lubrication. If you like the feel of one, you will like the other—provided the length is right.

Trade-offs at a glance

  • Length: 64L is 8.5 inches; 64M is 9.3 inches. The 0.8-inch difference is the only sizing distinction. Measure your erect length to decide.
  • Fit security: 64M may have extra slack if you are near 8.5 inches; 64L may be too short if you are over 9 inches. Match length to avoid slippage or tightness.
  • Girth: Both have a 64mm nominal width, so girth fit is identical. If 64mm is your girth, focus only on length.

Product facts

  • MyONE® Size 64L My Custom Fit® Condom: MyONE® Super-Wide Condom 64L combines Girth Number 64 (64mm nominal width) with Length Letter L (8.5 inches). This is the shorter of the two 64mm options, best if your erect length is around 8.5 inches.
  • MyONE® Size 64M My Custom Fit® Condom: MyONE® Super-Wide Condom 64M features Girth Number 64 (64mm nominal width) and Length Letter M (9.3 inches). This is the longest 64mm option, suited for those who need extra length beyond 8.5 inches.

Which MyONE size should you choose?

Best for

  • Those with an erect length between 8.5 and 9 inches who want a snug, tailored fit (64L).
  • Those with an erect length of 9 inches or more who need extra length to prevent roll-down (64M).

Not for

  • Anyone with an erect length under 8.5 inches—consider a shorter length letter like G or K with a 64 girth if available, or a smaller girth number.
  • Those with a girth smaller than 5.5 inches circumference—a 64mm nominal width may be too loose.