Chris Diamond’s modal blend is naturally anti-microbial. Because it wicks sweat, you can often get two wears out of a single pair before washing (provided you aren't working out in them). This means you need fewer pairs overall. You can get by with 7 pairs of Chris Diamond instead of 21 pairs of cheap cotton.
Here is a feature profile for a hypothetical premium product line: chris diamond underwear better
: Similar to the "sport shorts" style mentioned in some community discussions, brands like Chris Diamond’s modal blend is naturally anti-microbial