Bought this to use as a carport during the fall season to protect my car from falling black walnuts.  It has hollow poles and can act as a kite if you do not anchor somehow, I use ground anchors and cinder blocks for the section of the parking area where I could not get the anchors to drive into the ground.  Because I live in Ohio, this does not stay up year round, snow will destroy the tarp if you leave it out.