Begginer /out/er here, I was thinking about creating my own thread, but this is basically the same: I've recently experienced my first night /out/ sleeping in a cave with the outdoors temperature being around -8°C. I'm gonna repeat it next weekend and I wanted to ask for some advice as well as share some experience as an amateur to amateur. Layering and carrying extra dry layers of clothing is crucial, after hiking for 2 hours I've gotten to a very cold cave and without a dry sweater I would've definitely suffered until I could heat up the little stove. I'd forgotten to bring another pair of socks (had 2 pairs on me atm), which caused me some trouble. Other than that, make sure you have enough nutritious food, you're your own source of warmth and without fuel (food) you're screwed. Navigation in snow can be tricky, so make sure you know the path well or pick a straightforward one if new to the area (here the tourist marks are usually on trees/poles so they're visible in winter too). Other than that, I advice you to bring a buddy along with you, you never know.