XT2™ is a metallic fiber created by combining pure silver with cotton. We use XT2™ in our Silver Underwear, and Silver T-shirts. We use a slightly different version called X-Static in our socks. The silver's naturally antimicrobial and anti-odor qualities are woven throughout the entire product. It is not a chemical formula or finish treatment, so it never washes out.
Don't worry, you can wear Silver through a metal detector. However, don't wear it through an MRI or other highly-sensitive machines, XT2 has very low levels of silver but X-Static is more conductive and can interfere with MRI machines. Either way, always change into the appropriate medical gowns provided by your healthcare technician.