If you spend hours outside in the cold, Columbia’s Electro Interchange Jacket will keep you warm by pumping heat around your core. Literally. Inside its waterproof, breathable exterior, this jacket packs two lightweight rechargeable batteries that power heat throughout. Sounds a bit extreme, we know, but the three settings on the Omni-Heat Electric control system, combined with your own body warmth, guarantee you’ll stay toasty. Plus, the battery packs can charge your cellphone.