Vortex Bimini Tops are made with the best marine fabric available. It is the same fabric from which we have our covers made. The fabric is marine grade polyester that is treated and sealed in multiple ways. Specifically, it is double polyurethane coated on the bottom, or down side, as well as UV protected and mildew. Vortex Bimini Tops are simply the best option out there due to the quality, warranty, and incredible value. <br /> <br /> As far as the support system/framework, it is made with 1" square tube anodized aluminum. Anodizing is just a process that increases corrosion resistance and wear resistance of a metal. Aluminum is a fantastic material for the framework of a bimini top. Then, it is treated to make it even better. The fittings and hardware are all heavy duty nylon and stainless steel(mounting screws hooks, and eye straps). The top is very strong. <br /> <br /> Please notice 2 extra things we add in as part of the deal. <br /> <br /> 1. One is the rear support poles that come with Vortex Bimini Tops. Many bimini tops come with 4 straps (2 for the front, and 2 for the rear).Ours are better. Our square tube biminis come with straps for the front, and support poles for the rear. <br /> <br /> 2. The other bonus we throw in is the storage boot. This is normally a $20-$40 add on. <br /> <br /> To determine the width of top you need, measure from center to center across the rails where you want the bimini to mount. Vortex Square Tube Bimini Tops mount directly to the top of the rails pontoon boat, deck boats, really any boat! <br /> <br /> The length of top you need is generally just a matter of personal preference. We have 8’, 10’, and 12’ lengths. Instructions are included with the Vortex Bimini Top...easy quick job,… <br /> <br /> This square tube bimini comes with a 5 year warranty on defects in materials, both for frame and for fabric. <br /> <br />