ASL Solutions Dog Palace for Med to Large Dogs - Gray 2-4" of real foam (Styro/EPS) insulation in every panel Easy pass-through, self-closing, well-fitted insulated door (not a "flap") Self-storing window panes easily reposition from winter's closed position to summer's open cross ventilation position without tools Floor is insulated and raised 4" to provide a dry and warm bedding area Floor is sloped and has a drain hole to make cleaning a breeze - just hose down and water runs out