A few years back, I spent time camping in the Himalayas in winter, just to see a snow leopard. Each night, I packed two water bottles into my sleeping bag, plus all my camera batteries, chargers, and my phone—so they wouldn’t lose their charge or stop working. When I rolled over in the middle of the night, I had to negotiate all those tiny things like parents have to watch out for Legos on the floor.

That may be an extreme example of the need to keep your devices warm enough to function, but anyone who’s gone skiing, hiking, or climbing in winter knows the frustration of trying to use a phone while outdoors and realizing that it has lost most of its charge.

If that’s you, check out the Phoozy XP3 Thermal Phone Case. On the flipside, it also helps prevent your phone overheating and shutting down.

The case exceeds the 810G 516.6 military durability standard by more than 2X, because we all know we mean well when it comes to our phones, but we can also be butterfingers. The case also floats, and is water resistant, in case your phone lands in the water.

When you’re using the case, it can extend your phone’s battery life up to 4X in cold conditions and the Chromium Thermal Barrier reflects more than 90% of the sun’s heat to avoid overheating. Slip your phone into the case, which doesn’t add too much bulk. You can still fit it into your jacket pocket or backpack, or use the multi-point attachment system to connect it to your belt or backpack using a carabiner or lanyard. The internal stash pocket gives you a secure place to carry your ID, cash, and credit cards.

The XP3 Thermal Phone Case comes in a variety of colors and prints in the Phoozy Lifestyle and Realtree collections, and is available in two sizes to fit medium and large phones. It lists for $49.99 on the Phoozy site.