Works automatically with the slideout and helps protect it from water, dirt and debris when it's extended. The roller tube, bracket assemblies and wind deflector are all extruded aluminum for long lasting durability. Fabric is solid black vinyl and measures 185" L. Brackets and end caps are black with a black wind deflector. Fits slideouts with a roof size range of 174"-181.9" or 179"-186.9" flange to flange. Accomodates slideout extensions up to 42". Full case upgrade available as an additional purchase.