Explore More of what Nature has in store for you. Meridian Line will inspire your inner wanderlust with iconic imagery and superior comfort. Our well-constructed UPF 50+ UV/Sun Protection Performance tops are ideal as a base layer or to conquer the summit heat. So go ahead Be Dareful Out There with Meridian Line. The UPF Solar Long Sleeve shirt offers superior sun protection and performance qualities. Featuring UPF 50+, the UPF Solar shirt is both breathable, lightweight, comfortable, and sure to keep the sun's rays from penetrating through to your skin. The 4.1-ounce, 100% Microfiber Polyester fabric is powered by our PURE-tech moisture-wicking technology which is permanently infused in the fibers of the fabric. PURE-tech's intelligent design is shown to improve the body's core performance as it moves perspiration away from the body, pushing it outside the shirt. Because of this technology, our UPF Performance Shirts dry far faster than standard cotton garments. Our UPF shirts also include M-Shield which keeps our fabrics fresh, attractive and ready for more.