This structure has a corrugated plastic UVB type roof assembled in panels which slide into steel rails. I read a lot of horror stories from people setting this shelter up. As long as the roof panels get delivered without damage, this roof is fantastic. Make sure when assembling that the panels are all the way up in between the rails. Very well built structure. I had no missing pieces and did the assembly with my 11 year old daughter. She used a small bench. Very satisfied, and would recommend this to anyone. Time will see how it lasts. Got it for $760. Great deal.