Posted Online (Jul. 28, 2017) -  Jeep and Haartz have worked together since 1954 to go above and beyond to provide the best softtop material for the Jeep Wrangler.  The latest models use Haartz Twillfast RPC and Single Texture PVC fabrics.  Nadeem Muaddi from The Hog Ring reviews the past and present in his recent article.