ColdGear® Reactor intelligent insulation adapts to any degree of activity. Warmer when you cool down. Cooler when you pick up.. Reflective logo & taping for increased safety & visibility during low-light runs. Cupron® Mesh kills odor-causing microbes & improves skin tone & flexibility. Material wicks sweat & dries really fast. Locked-in UA compression fit increases muscle power & is comfortable enough to be worn all day. Smooth, chafe-free flatlock seam construction for zero distractions. Sold as a set of 2 sleeves. Length: 18"