Fit: fitted : Four-way stretch material for better movement in all directionsThe material wicks sweat and dries very quicklyReflective details for increased visibility during low-light runsEnhanced laser perforations at the front and back for better airflowLightweight Iso-Chill fabric helps dissipate body heat, making it cool to the touchUPF 30 protects your skin from harmful sun raysSide vent hem