Mack Weldon advertises that their underwear uses Silver XT2™ technology:
Made possible with Silver XT2™ technology, silver naturally destroys odor-causing bacteria. We added Pima cotton to keep you cool and comfortable all day long.
NanoSilver provides a similar promise:
Compared to most garments Nanosilver offers a unique properties- it conducts sweat and is antibacterial.
Is there misleading marketing or does silver really provide advantages at fighting odor-causing bacteria?