Durable foam construction makes hinged lid containers a perfect lunchtime or dinnertime choice. Containers are insulated to maintain food temperatures at their tastiest. Excellent for use with both hot and cold foods. SmartLock closure keeps food secure. Hinged lid foam containers provide a safe and durable option for taking food on the go. Medium. Food Container Type: Hinged Lid Container; Materials: Polystyrene; Food Container Material Type: Foam; Colors: White.