This medium/firm comfort mattress is approx. 9" deep,  one sided and has a 12.5 Gauge open coil sprung unit, with 40mm (4cm) of memory foam on top offering pressure relieving comfort , its covered in luxurious stretch fabric which has been micro quilted to hold everything in place. The sides have stitched handles to help rotating the mattress, it also has air vents on both sides to allow the mattress to breath.