Sizes: Available in 3ft, 4ft, 4ft6, 5ft and 6ft. Support: 13.5 gauge open coil bonnell spring for added support. Memory Foam: Features a memory foam layer. Features: Hypoallergenic and anti-dust mite resistant. Comfort: Relieves all pressure points in your body. Perfect: For improving the quality of your sleep! Product: Get yourself a luxurious Grey Memory Spring Mattress!