The Bodyform® Orthopedic Gel-Infused mattress cushion is made from ultra-quality high density memory foam which retains its performance better for long lasting support. The 2.5 Lbs. density Gel-Infused foam provides plush support with a cool surface feel. It is temperature regulating to eliminate unnecessary sweating. The unique 4 zone convoluted design provides proper support and provides pressure relief for a good night's sleep. Slightly smaller than the mattress surface to provide a proper fit under a fitted sheet, dimensions are 200.7 cm x 190.5 cm x 3.8 cm (79 x 75 x 1.5").