The box is 4 foot long 2 foot wide into foot deep and has quarter inch wire mesh for the bottom flooring it has half inch wire mess on the sides for ventilation during spring or summer months it is right now currently wrapped in a she cloth to help regulate temperature during the winter months. I have a 150 watt light bulb for heat to regulate the heat and temperature in there. I currently have straw hay for bedding thinking about moving more towards pine shavings not sure.