WeatherTech 04+ BMW X3 Front and Rear Side Window Deflectors are designed to provide protection from the elements while allowing fresh air to circulate in your vehicle. These deflectors are made of high quality, durable acrylic that is darkened for a sleek, custom look. They also feature a no-drill installation that requires no special tools or knowledge. The deflectors provide a barrier between the window and the elements, allowing you to enjoy fresh air while keeping the interior of your vehicle protected from the rain, snow, and other elements.