Nothing kills a big day out in the great white beyond more than freezing digits. And while the packets of hand warmers do the job for a few hours, those yearning for longer-lasting heat should consider the P3 International 3-in1 Smart Warmer. The USB-rechargeable device heats up to as high as 104 degrees, which should be enough to cut through any arctic chill (red and green lights on the device indicate the heat status). The pocket-sized piece measures 5.5 inches—and you can also use it as a flashlight or as a backup battery for your USB-fed devices (hence the “3-in-1” part of the product’s name). It comes in a fun knit sleeve, added incentive if the intended recipient is a junior cold-weather adventurer.