Your sleeping pad is the real MVP

The single most effective technique for staying warm in a cold-weather tent is a high-R-value sleeping pad, because most heat loss escapes into the ground.

You can have the warmest sleeping bag in the world, but if you’re sleeping on a thin summer pad, you’ll be cold by 2 AM. The ground sucks heat out of you fast. Get a pad with an R-value of at least 4.5 for serious cold, or stack two pads if you already have a foam one. Cheap trick: put a closed-cell foam pad under your inflatable one.

After that, it’s about managing moisture and layers. Do not wear your puffy jacket to bed if you sweat—sweat kills insulation. Instead, sleep in a thin merino base layer, eat a fatty snack before bed (your body burns it overnight), and pee right before you zip up. A Nalgene full of hot water inside your bag works like magic.

And here’s the counterintuitive one: vent your tent slightly. Cond