my favorite tarp, with doors, is positively my Old Man Winter
from Wilderness Logics.
the 3 side stake outs make for a tighter pitch allowing superior weather shedding, rain or snow.
i also find that when the doors are closed, i have more usable space than i had with my other winter tarp.
if i could only have 1 tarp, it would definitely be the OMW.
when it comes to skins, most use mesh because they will allow a damp tarp to breath a little.