You don't always have tons of spiders and such on you just using a tyvek sheet? I tried a few different times to just throw my pad down and I constantly had bugs all over me here in Az. I know almost always take a shelter simply for bugs. I think the black river officially ruined me when I slept on the ground and when rolling up my pad the next day, there was 5 or 6 scorpions under it and when I got home, I found one of those little basterds in my clothes bag with a bunch of babies on her back. I HATE SCORPIONS! haha. Damn things have stung me twice.