Arc'teryx Fernie LS Shirt Women's Allatorre - 95% nylon, 5% elastane FERNIE LS SHIRT - Versatile and comfortable, the short-sleeve Fernie takes proven hiking and trekking performance, then updates it with a clean, contemporary aesthetic. BREATHABLE MATERIAL - Allows moisture vapour to escape, helping regulate temperature and elevating comfort inside garment. HIKING & TREKKING - For technical hiking, trekking, durable and protective designs for remote and varied conditions. SYNTHETIC FIBRE - Engineered materials that offer enhanced properties or performance. UPF RATING (SUN PROTECTION) - A textile that provides protection from exposure to ultraviolet radiation. Use in sun or on snow.