800 Fillpower Hyperdry proprietary nanotechnology treated down. If it sounds high tech, it's because it is. It is one of the lightest down quality available on the market — the down clusters are capable of trapping an extreme amount of air which makes the gaments very puffy and lightweight. It is also water resistant. This means the down will stay dry longer in harsh outdoor conditions, and dry faster.
The producer, Allied Feather & Down in California, USA, has developed proprietary nanotechnology treatments and procedures creating a uniquely effective water resistant down. These methods provide an invisible coating that does not compromise the texture or color of the fill. Extensive testing shows that the drying time is halved from regular down, and that no matter how many times you wash it, it will still stay water resistant. This also gives the down a longer life.
So it is super light, super warm, water resistant, washable and extremely durable.