Hi Stephen,
If you are a borderline between two sizes and having first selected the shorter version or simply have a size that you think could be a bit longer than the one you have now, then go a size up on your next order and see. You also a good amount of latitude for adjustment in the way you fold the base band much in the same way you can control the length of the pant leg with a smaller or bigger overlapping of the base band folds. If you have an obvious gap between the silicone ring and the glans then there is no question that you need to go up a size in length. For your reference each size up in length “A” series thru “C” is 1 cm longer and then “C” to “D” and the rest of the series is 1.5cm longer each size up in length.
