Go for a run wearing the Patagonia All Weather Zip Neck T-Shirt that can be worn either on its own or as a second layer. It features the Polygiene® technology that assures fresh climate, and an Air Flow-mesh panel that provides breathability. An UPF of 15 shields you from the harmful UV rays. This bluesign® approved zip-neck is tailored using a blend of polyester and spandex jersey knit. It has a front zipper that runs to the collar, and multi-functional cuffs equipped with thumb holes and fold-over mitts.