1. Wear layers of clothing to trap body heat.
2. Wear a hat and scarf to keep your head and neck warm.
3. Use a sleeping bag that is rated for cold temperatures.
4. Use a camping mat or an air mattress to provide insulation from the cold ground.
5. Use a hot water bottle or a hot pack to keep your feet and core warm.
6. Use a tarp or a tent to block the wind and provide additional insulation.
7. Use a campfire or a heater to provide additional warmth.