If you're lost, hopefully, you're uninjured and still have the energy to scrape a shelter together. It has to keep you dry, relatively warm, and, above all, keep you off the ground. To learn what the different shelter designs are, what their drawbacks are and how to make them, check out this video.

Above all, you need your shelter to keep you off of the ground. You could have a super shelter that is capable of fending off monsoon amounts of rain, but if you are laying on the ground, chances are you'll still be freezing to death.

A good shelter will allow you to reflect heat from the fire onto your body. If you don't have time to rig that up, throw down enough leaves and branches to lay on so you high enough off the ground to where you won't lose heat through thermal conduction.

An important note to take away from this video is that you don't want your shelter to be too big. A large shelter is harder to heat, harder to repair, and takes a huge amount of time and energy to complete. While you will have plenty of time as you wait for rescue, you should probably save your energy; you have no idea how long it will be before help arrives.