We use a mattress topper as a mattress from Crazy Sales on the net, we can only have 100mm thickness due to the rear fold camper trailer. The mattress toppers come in differect thicknesses ours is 50mm of high density foam with 30 mm of gell on top, total 80mm, then fitted with a foam mattress topper from Clark Rubber, we have spent near 6 months on the road over the last 18 months its just as comfy now as when we fitted it in the camper.