The Cover Top is a great accessory to protect your Flex-Bow tent investment. Some of the benefits of the Cover Top include:Protect your tent from dive-bombing birds, or those birds that like to perch directly above your perfectly shady camp siteKeeps the weepy tree junk and tree sap off your tent roofImproves temperature management - can be used to help keep your tent cooler on sunny days, and help your tent retain heat on cooler nightsImproves your tent's breathability during wet weatherProvides more shade on a hot summer dayMakes your tent darker on those full-moon nights (for those who like it darker when they sleep)...and drum roll please... it works with your tent's awning!The Cover Top is made from a heavy-duty poly-cotton canvas. The Cover Top is water tight and blocks light (it's totally opaque - light does not pass through this material).