Hi there Edelgado, Thanks for selecting Future Day Flyers in your printing requires. We now have lots of cardstocks for flyers. Apparently, we do not need a water-resistant materials however We've got h2o-resistant cardstock. Double parallel fold – this fold possibility helps make 4 panels by folding the paper in https://cesarzpdqd.mappywiki.com/1167165/flyer_printing_options