The Alpha 5" Woven Short features a lightweight stretch woven fabric, providing great moisture management and excellent comfort to this premium piece of running gear. Specs ? 5" inseam (Size M) ? Lightweight mechanical stretch woven fabric ? Traditional brief liner ? Waterproof zippered back pocket ? Elastic waistband with drawstring ? Anti-microbial treatment to help eliminate odor ? Reflective logo ? Fabric Breakdown: Stretch Woven (100% Polyester), Jersey Liner (87% Polyester, 13% Spandex), Mesh Liner