The UltaMid 4 Half Insert creates a barrier against bugs and moisture for two people inside the UltaMid 4 Shelter, so a restful night of sleep is more likely assured wherever home is for the night. Use the other side to protect and store all the gear on dry ground or our if moisture is a concern. The Half Insert is also an excellent option for separating muddy gear from slightly cleaner sleep systems or clothes. UltaMid 4 Tent, Ultralight Stake Kit, and UltaMid Carbon Fiber Tent Pole sold separately.