13 Inch Queen Size Accu-Gold 5.3 Visco Elastic Memory Foam Mattress Bed Accu-Flex 8-inch medium firm support base layer for spinal alignment and total body support Two visco-elastic layers include one 3-inch Accu-Gold 5.3 layer and one 2-inch Accu-Aire 3.3 memory foam layer Accu-Gold visco-elastic memory foam is comfortable and durable