It is covered on the outside with shade cloth and the inside along the three side sections has tarps from the peak spine that skips a horizontal member and anchors to the next. The skipped horizontal member acts to keep the shade cloth away from the tarp. There is one additional tarp panel on the South side that goes all the way down to further block the sun inside. This configuration keeps the tarps from getting too hot and radiating heat inside. Also, the shade cloth breaks the wind and the tarps don't flap. It stood up to everything the playa threw at it this year. The long side in the photo was facing South. The structure didn't shake, didn't wobble, it was rock solid.
The key design concept is to present as little surface perpendicular to the wind as possible. Presenting lots of angles has worked to keep the thing down on the ground where it belongs. There are two center support poles that go from the top spine straight down to the ground on either end of the center section that keep the center spine from sagging.
This is the structure's second year on the playa after we lost our main structure in 2008. (the recycled billboard vinyl we were using as a cover shredded in the wind as I suppose several years of UV on the playa and heat from storage in Empire had taken its toll on it). We added the inner tarp panels this year as we discovered it was too hot inside last year without them. This year was pretty good but we didn't have a really baking hot day this year after we put the structure up.
The drawback to the structure is the ends where we had to cut the + fittings and custom weld them back together at the correct angles.