It may not look like it but the image of a feather you see above is actually comprised of thousands and thousands of naked human bodies. Seriously, look at the up close shots of the feather below and you’ll see bodies laid out holding each other to form each string.
If you're a believer in science, you're probably at least vaguely aware that prevailing theories posit that the birds of today are distant relatives to the dinosaurs that died off millions of years ago.
A puffy down feather jacket is one of the lightest and warmest things you can wear. But the tradeoff is that if you get it even the slightest bit wet, you'll be wearing a cold soggy mess. Not the Brooks-Range Mojave, though; thanks to a special coating on the feathers, it doesn't skimp on the warm when it's wet.
It's light. It's flexible. It withstands frigid temperatures on top of a mountain. And in the entire history of humans staying warm, nobody's been able to beat it. Here's how you build the most powerfully simple jacket in the world.