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. stove windshield portable stove windshield can be folded and disassembled at will for easy portability. 2 in 1 stove rack windscreen extremely easy to and take-down,convenient for hiking,backpacking,picnics,survival. Its tall enough to provide wind protections for stove mounted on the largest isobutane cartridges and the like.