When camping in "humid" areas, you can be bothered by tiny mosquitoes and flies. A zip-up mesh door is therefore a very nice accessory. It allows you to keep all the annoying insects out. The insect screen is made of 100% polyester and can be easily attached using a zip. The gauze door is made of mosquito gauze. Mosquito netting is 3x finer than standard tent netting so it keeps out even the smallest insects.