The Ultimate Winter Accessory? A Jacket That Lets You Add Insulation In Seconds

During the winter months, you might notice that pigeons, sparrows, or whatever birds populate your city stand stationary with their feathers puffed up. This peculiar move has a very practical purpose: it traps more air than when the birds’ feathers are flat and, hence, also traps more heat. The same principle is at work in NuDown’s line of jackets that allow users to better regulate how much warmth their outerwear offers—with air. Read more at Fast Company.