We are pleased with our Teryx-4 side enclosure. It arrived in a timely manner, it was easy to install, it fits well, and it looks nice. It is relatively easy to get in and out by simply unzipping the window. It's made of sturdy material and the price was right. The enclosure helps keep out the cold wind but you can't expect it to be "air-tight." We have only driven with it twice so far, but we are glad that we are able to use our UTV longer into the Northern Wisconsin winter!