One of the best sleep systems you could choose for wild camping would depend on different factors, such as the environment, season, and a person's preference. However, here are some great options that are typically included in an excellent sleep system specialized for wild camping. 1. Sleeping pad - A sleeping pad is a functional tool that retains heat and helps you sleep comfortably with its insulation capacity despite placing it on cold ground. There are different types of sleeping pads, namely air pads, foam pads, and self-inflating pads. 2. Sleeping bag - This tool is designed for its capacity to keep you warm despite any drop in temperature during your camping trip. Select a mummy-style bag for the cold climate, and choose the one with a rating below the lowest temperature you expect to encounter. 3. Tent - A tent is a camping tool that provides shelter outdoors. It would help keep you protected from the cold weather. It would be best if you chose a tent with a high rating concerning its waterproof capacity, pole strength, and adequate ventilation. 4. Clothing - Layering is essential to staying warm outdoors. Wear a base layer of wool or synthetic material to wick away moisture, a mid-layer of fleece or down for insulation, and an outer layer of waterproof or breathable fabric to protect against the elements. 5. Headwear - A hat or beanie that would help protect your ears and your head from the cold weather. It will help keep you warm and would retain your body heat. Overall, the best sleep system for wild camping provides comfort, protection from the elements, and the right amount of insulation for the expected conditions.