The Exo Terra Flexarium offers optimal ventilation, very important for certain reptile species, such as chameleons. The nylon mesh allows ultraviolet radiation from fluorescent UVB lights or the sun to penetrate deeply into the enclosure. Due to the strong nylon mesh and durable construction, the Flexarium can also be used as a permanent outdoor enclosure in warmer climates or as a temporary enclosure during sunny and warm days in cooler climates. The Exo Terra Flextray (sold separately) can be used to hold substrate and/or contain water inside the enclosure.