FreshIQ3; advanced odor protection technology attacks the odor-causing bacteria in your clothing that causes your underwear and socks to smell - so now you can feel fresh all day. X-Temp technology is designed to adapt to your body temperature and activity to keep you cool and dry for all day comfort. Has a UPF rating of 40+ for protection against harmful UV rays. Tri-blend performance fabric feels amazingly soft and light. Slightly tapered fit updates your casual look.