These Boy's Long Performance Boxer Shorts is made out of a 100% Polyester Mesh fabric with breathability and moisture wicking technology ensures fast drying while keeping you cool and fresh all day. These comfort fit athletic underwear features: comfortable elastic waistband that eliminates chafing, functional fly, 9 - 11.5 Inseam length varies according to size. These Boxers are great for running and working out and for all day use.