Saucony Men's Speed of Lite Singlet Premium Tech Knit: 72% Polyester, 11% Polyester X2, 17% Spandex, Ventlite + X-Static Xt2: 87% Nylon, 7% Polyester, 6% Lycra Imported Long, lean fit with shaped bottom hem and slight drop-tail so it won't ride up Our Premium Tech and VENTLITE Mesh fabrics contain X-Static XT2, for permanent anti-odor and anti-microbial performance to keep you dry and odor-free Made with pure silver, which naturally inhibits the growth of bacteria in fabrics, keeping odors in check and gear smelling fresher Four-way stretch fabrics and shifted side seams for chafe-free performance Long, lean fit with shaped bottom hem and slight drop-tail so it won't ride up