Three Trapezoidal Design: The cat playpen adopts Three-trapezoid design to better keep standing and it is not easy to overturn, preventing pets from climbing and escaping.The pet tent is equipped with ground studs, making it more convenient to fix it on outdoor grass and sand. Top Zippered Design: The top zipper allows you to easily place fresh water, or toys. It provides easy access. You was able to keep him safely contained when you wasn t able to monitor him. You can remove it for washing, if necessary. It's also nice for outdoor use if you wanted to place the enclosure on your lawn.