Aluminum exterior and interior - non-pass-thru design. Proof or hold with adjustable temperature from 80°F-175°F (27°C-79°C). Fully insulated top, sides, back and base. Sliding double Lexan® doors, easily removable without tools for cleaning. Separate controls for heat and humidity. Dual air heaters and circulation fans evenly distribute temperature throughout cabinet. Self-draining feature collects excess moisture into a standard bun pan (not included) below the base of cabinet. Extruded pan support/air duct assembly, easily removable without tools for cleaning.