The power to withstand temps and it fits in a pocket? Sounds like science fiction ... but it's actually our Wide Channel 600 Down Puffer. It's got lightweight, water-resistant nylon fabric inside and out, with powerful 600 fill power down insulation in-between. And the whole thing can pack down into its own inside left pocket. So you can stow in the glove box, weekend bag, locker — you name it — and never get left in the cold again.