image titled air out a mattress step 4 Mattress Meaning. wood foundation with legs. Dorel Home ThermoBonded Polyester Core Mattress Twin. Lucid 3 Inch Ventilated Memory Foam Mattress Topper. . Innerspring Mattress. Serta Raised Air Mattress. Amerisleep memory foam mattress and foundation. Easy to fit I was expecting to feel some lumps and bumps from the mattress but the topper filled them all. A mattress topper is a soft cushion that sits atop a mattress to provide extra comfort.