The Patagonia Isthmus Anorak is constructed from 95% nylon (65% recycled) and 5% elastane, the Patagonia Isthmus Anorak Burl Red is designed for all year round use. Boasting a Durable Water Repellent finish and delivering 40 UPF sun protection, this lightweight windbreaker pullover offers comfort and water-resistance while drying quickly.