Get access to everything we publish when you sign up for Outside+.
Down is everywhere these days, on city streets as well as in the backcountry. Even the water repellent version has become ubiquitous: Twenty brands now use DownTek, the leading brand of DWR down. Yet most devotees of down know nothing about the plumage they love to swaddle themselves in. Even some industry insiders have shockingly little knowledge about the puffy stuff we apparently can’t live without.
Think you can count yourself among the cognoscenti? Read on and find out. We’ve amassed 25 things you probably don’t know about down—no matter how much of it you’ve worn.