The Inov-8 Base Elite Long Sleeve Undershirt is perfect for spring and autumn; Ideal for sweaty runs on cooler days. The shirt drains sweat super well and it dries quickly. The undershirt is made of recycled polyester, which makes the way of producing better for the environment! The flat seams ensure that your skin does not get irritated. You want to take this shirt out of your closet time and time again for your running laps.