UPF FABRIC: Smooth-as-silk UPF 50 + protective jersey knit wicks moisture and dries quickly to keep you comfortably protected all day MOISTURE WICKING: Ideal for all-day sun protective, high performance wear for the outdoors. Super soft jersey knit wicks moisture to keep you comfortable and dry MOBILITY: Dropped shoulders to enable big reaches and full range of mobility ADDED PROTECTION: Arm gussets for a chafe free all-day comfortable use LIMITED LIFETIME WARRANTY: Limited Lifetime Warranty covers defects in materials and workmanship for the practical lifetime of Mountain Hardwear brand products manufactured by Mountain Hardwear One of our classics re-tooled, the Canyon Long Sleeve Shirt is the ultimate wrinkle-resistant, quick-drying shirt for hiking and trekking. Made from 100% polyester dobby fabric, it combines durability and performance all in lightweight package