Include this fly upgrade kit with your IBNS and you will have a complete Enhanced BedNet System. Permethrin Insect Protection - Made to protect soldiers from insects while asleep or resting on military cots. The Upgrade fly is constructed of 70 Denier 1.9 ounce nylon ripstop. The EPA registered BedNet has permethrin bonded to the fabric for insect repellency. The Upgrade Kit includes the fly, (1) Shock corded pole, (6) X3 stakes. The kit weighs a little more than two pounds.