+1 on the two piece ones. I had a pair made for my first tarp which was the superfly. I recently bought an edge tarp for fairer weather and I bought another two piece set of skins for it as well. Both of mine are made out of no-see-um netting. The advantage of this over silnylon is that the mesh ones allow your wet tarp to dry while the silnylon doesn't breathe. Just skin up the tarp after shaking to remove what you can of the water and place them in an outside mesh compartment on your pack.
Hello from Lookout Mountain in N.E. Alabama,home of Little River Canyon National Preserve- The deepest gorge East of the Mississippi.