Bought two of these to cover my 4x8 bed, so got two of them.  I intended on using them to prevent Carrot flies and Onion pests.  Was easy to install and worked as advertised.  I had read that the zipper function was not accurate, but before ordering read that they had corrected that issue.  It worked beautifully for me.  Living in the South Texas area, it has been hard for me to put it on due to the high temperatures we are still getting, but hope to use it more during the winter