This blind features a fully adjustable roof that allows you to hunt with it as open as you like or cinched down to narrow slit, just wide enough to get your gun through. The less gap you have in your window system the more likely deer will be relaxed and not take notice of the blind. This blind also features an adjustable framework, which is why we pre-stretch our fabric, and incorporate a rotating/locking hub in our blind frame. If the fabric seems loose, simply rotate the hub which lengthens the strut and tightens the fabric, eliminating wind flap.