MATERIAL: High-performance solar knit with UPF 50 fabric that wicks moisture away from the body this lightweight, breathable short sleeve shirt protects against harsh UV rays whether you're beachside, rock climbing, hiking, camping or exercising outdoors UPF FABRIC: Constructed from UPF 50 fabric ensures you stay protected against the sun's harsh UV rays from coastal waters to high-desert mountains COMFORT FIT: Gusseted underarms for chafe-free all-day comfort wear MOISTURE WICKING: Solar-knit fabric pulls moisture away from your body and dries quickly to keep you comfortable on the trail, treadmill or the rock 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