I'm glad this question was asked. I've got a friend who drives a TJ and he left the top off a week or so back and got everything soaked. He was worried about it and wanted to take the dash apart and rebuild it with better waterproofing. I convinced him that the manufacturers had planned for water to get in and that he should leave the dash how it was. As for his seats he's got the cloth and they didn't drain so quick. Oh well, towels work well from keeping your bum dry.