Question: is 80 down 20 feather warm?
Answer: A 600 fill power down jacket with an 80/20 down to feather ratio will be warmer than a 600 fill power jacket with a 70/30 ratio. ... Feathers are ideal for harder and more durable products like seat cushions, but down is better for providing warmth and comfort in jackets, sleepings bags, and duvets.