My Structure Was 10 x 12, But Had a Peaked Top
I ordered one size larger than the structure circumference and placed a large rubber ball under the tarp at the peak to take up the slack. This not only worked perfectly, but looked great with the rounded top! I would have liked the option to purchase the tarp with more grommets. But, overall, it was perfect and easy to setup. And this option cost less, too.
ProsEasy to work with it.
ConsI would have liked the option of more grommets to pull this taut and keep rain pockets away.