FreshIQ 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. Made with an ultra soft cotton/modal blend for all day comfort. Cool Comfort wicking fabric keeps you cool for all day comfort. Lay Flat Collar is designed to keeps its shape. Undershirt is designed to stay tucked in for a confident fit. Tag-free for itch-free comfort. Available in a convenient assorted Black/Grey 4-Pack.