Transparent and breathable: surrounded by nets, you can monitor your pets at any time, as well as ensure the ventilation of the playpen and eliminate odors. Automatic opening: no need for complex splicing , the built-in frame opens in seconds. Folds flat when not in use for easy transport and storage. When opened under spring pressure, it should be kept away from children and face. Exterior or interior: The pet exercise fence is easy to carry and you don't need to carry a huge cage when you take your pet out. It may limit the range of activities for pets (it may not be suitable for pets with jumping, climbing and biting habits). Size and material: Width and height after expansion 47in*15in (120cm*37cm); Durable polyester fabric that's easy to clean. Suitable for small pet playpens, can also be a kid's ball pit providing hours of interactive play.