Standard fit: This garment is true to size for an easy, comfortable fit. Still named after the highest peak in the Western Hemisphere, the Aconcagua returns for another round of cold-weather hiking adventures. But unlike the original, this updated version comes with a 50/50 blend of 600-fill recycled waterfowl down and recycled polyester for exceptional warmth, even in wet and damp conditions. It's still the perfect layer to pull on when you want light protection where you need it most.