Condom size is probably the most important property of any condom you're researching. If a condom is too small it can be constrictive and hamper men's.
Learn about condom brand sizes, and how to choose the right size, here. Condoms that are too small may break, and condoms that are too.
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Here's the approximate breakdown in condom sizes based on length and they'll help you figure out if you're sized small, medium, or large.