Originally developed for NASA and military special forces, garments made with real silver like the Mack Weldon Silver T-shirt ($37) and boxer brief ($28; mackweldon.com) kill microbes so the wearer can go days—even weeks—without feeling (or smelling) bad.The metal's technical properties enabled designers to get away with using fabrics like pima cotton (usually a fitness-apparel taboo, as it's a sweat absorber) and Lycra to provide softness and stretch. Added bonus? The brief's waistband is made specifically to not roll over or bunch when you sit on the spin bike or squat. It's one giant leap for mankind.
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