The Velcro netlon can be fixed easily by bringing the two vecro parts together and at the time of installation, they can be fixed to the windows or doors with a stapler or with super glue. They can be easily detached for cleaning and put back on easily. The net comes in many different colors.
The netlon has a special feature at the corner of the whole mesh that does not come in the way of light that looks like a pull out knob. It prevents the entry of not just mosquitoes but also other bugs, and lizards also.
One part of the Velcro strip can be permanently attached to the windows or doors and the other part along with the mesh can be detached.