Thanks to 40 years of extensive experience in working with down, Fjallraven has managed to establish a unique and transparent production process where all of their down is 100% traceable. Fjallraven guarantees that all of their down products contain only the highest quality, ethically produced down. This lightweight and highly compressible down favorite is one of the warmest jackets on the planet. Take that long trek during the coldest months of the year. You'll be fine.