With a trip to the Rockies coming up, its time to log some prep time on the trail. Get in the after work tune ups in the incredibly air permeable Marmot Mens Windsheer Short Sleeve Shirt. In just a couple of hours you can bust out some mileage with this wicking and drying shirt that has stretch and gusseted underarms for unrestricted movement. Better yet, you can still be on time to Tokyo drift into town for dinner no change of clothes necessary. Fabric is 100% polyester plain weave stretch 3.4 ozyd. AirExchange performance fabric. Packable, air permeable, lightweight fabric. Ultraviolet Protection Factor UPF 20. Polyester for quick drying and wicking. Mechnical stretch for added comfort. Gusset for range of movement. Contrast inside collar stand. Durable flat felled seams. Shirt tail hem. Single patch pocket. Regular fit. Avg. wt. 6.35 oz. 180g.