Best suited for penis with girth up to 10cm (erect). MySize is a German condom brand that has done a lot of research on condom sizes. A well-fitting condom is important for safety, but it is also more comfortable for him to wear. MySize 45 are condoms with a nominal width of 45mm, and a length of 160mm. Narrower condoms are a bit tighter so this condom does not slip off during intercourse.