Helpful Hook and Loop Attach the included Hook and Loop to the shade and the door jam on your vehicle where it is slipping to secure the window shade for the perfect fit on either front or back doors, regardless of shape. The Wing Mirror-Fitting Hole Adjust the shade so the entire window is covered, and the shade fits tightly around the window. PREVENT ANY SLIPPAGE BY STABILIZING THE SUNSHADE WITH A HOOK AND LOOP! How to install car window shade: First, align the car window from the top. Second, cover the window tightly with the car window shade. Last, line the hook and loop tape for perfect positioning, then stick it on with the shade. Based on the laws of some states, anything blocking the view mirrors while driving may not be allowed, so please check your local terms and conditions first.