Named after the hardest long free climb in Yosemite Valley, Outdoor Research Mens Astroman Short Sleeve Shirt is the perfect woven technical shirt built with UPF 50 sun protection and Sun Snap Collar for added protection from the sun. Fabric is 85% nyon, 15% spandex. Breathable, lightweight and quick drying. Wicking performance. Movement mirroring stretch for comfort. UPF 50 sun protection. Concealed snap chest pocket. Logo placket label. Contrast grograin in collar. Curved hem. Ring snap closures. SunSnap collar. AirVent inner back yoke. Standard fit. Avg. wt. 5.4 oz. 154g. Center back length 29.25.