Sure, it's obvious to bring a shell when skies are gray, but the Mountain Hardwear Stryder Full Zip Jacket provides more than basic rain defense. This jacket's recycled nylon shell not only features a DWR treatment to bead away light precipitation, but it's also rated UPF 50 for solid sun defense on high-elevation hikes and climbs. Even in hot, sunny weather, this lightweight jacket allows airflow thanks to a mesh lining and vented back yoke.