Coverking Custom Fit Car Cover for Select BMW Z4 Models - Satin Stretch (Black) Made from an elastic synthetic fabric with a unique fleece lining, the cover stretches in all directions and molds to the contours of your vehicle to highlight its design This form-fitting fabric creates a soft and smooth finish that is intended for indoor use only Manufactured with three-piece construction using blind stitching to hide all seams Tailor-made to the exact specifications of your vehicle's year, make, model, and configuration options No straps or tie-downs needed to secure the cover due to the stretchy elastic