Bottom vents allow airflows to circulate.And the built-in can be firmly inserted into the ground to that the windshield will not be down by the wind. This portable stove windshield is foldable for easy storages.It is a great equipment for outdoor picnics cooking,barbecue. 2 in 1 stove rack windscreen extremely easy to and take-down,convenient for hiking,backpacking,picnics,survival. stove windshield portable stove windshield can be folded and disassembled at will for easy portability. Its tall enough to provide wind protections for stove mounted on the largest isobutane cartridges and the like.