How to measure penis size and choose the right condom?

At the thickest point of a fully erect penis,

1. Measure with a tape/rope/ penis measuring stick around a circle
2. Divide the value by 2 to get the width.

If you choose latex/PI condoms(SKYN), due to the high elasticity of the material, you can choose -2mm width condoms;
If you choose PU condoms (such as 001), Select condoms with the same value.

Example:

The circumference of Xiaoming's penis is 108 mm, which is 54 mm after dividing by 2. He should choose a PU condom with a width of 54mm, or a latex/PI condom with a width of 52mm.