I measured my unit diagonally, from corner to corner it's 36 inches, so I opted for the 36" x 36" option and it fits perfectly. It looks great and fits nice and snug with the included bungee cords.The hooks on the bungees did not have little protectors on the end as shown in the photo of the listing.The material of the cover seems well made, a vinyl like top layer to protect from the elements with a fabric bottom to protect the unit from scratches. The eyelets appear to be solidly affixed to the corners and it's not some thin material that feels like it'll rip apart with age. Only time will tell how well it lasts.
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