This UV50+ quarter zip base layer will assist control your body temperature whether running, riding, or walking the dog, and it has ventilated underarms to keep you cool and dry. Sweat-wicking, anti-microbial, and featuring 360 stretch for unrestricted comfort, this base layer can do it all. The silky-smooth fabric, ultra-soft seams, and flat lock stitching eliminate chafing and bulk when worn under a fleece, jacket, or gilet. Designed to match the most popular LeMieux hues for hat silks, saddle cushions, fly hoods, and other accessories. Sweat-wicking fabric with UV50+ protection Vented under arms for breathability 360 stretch for comfort and freedom Ultra soft seams with flat lock stitching