99extra Underwear, Men's Mesh Holes Bamboo Fiber Antimicrobial Briefs 95% Bamboo Fiber/5% Spandex Imported Hundreds breath mesh holes quick to take perspiration and heat away * Bamboo fiber contains an antibacterial substances called "Bamboo-Kun", it will inhibit the growth of bacteria, prevent mites, deodorant, Japanese scientists have found that bacteria which on the bamboo fiber products will be killed about 75% after 24 hours *According to authoritative testing figures, apparels made from bamboo fibers are 1-2 degrees lower than normal apparels in hot summer. *Preferably on the delicates cycle, and don't use bleach or fabric softener. Neutral detergent can prolong the life cycle of underwear. * Doctor advised, a underwear don't use more than 6 months, it will become very dirty although you repeated wash it