Down is the most effective commonly-available insulator for outdoors apparel. But, it's also expensive, loses its ability to insulate when wet (if untreated) and — there's no way around this — is horribly cruel to most of the ducks and geese who donate their underfeathers. Now, there may be a real alternative: milkweed.
Source Gizmodo http://ift.tt/1yxb9g7
