Highloft 4″ Memory Foam Mattress Topper for $67.44. Shipping is $1.00, so the total comes to $68.44 shipped. Here is a screenshot for your reference. It is made of 3-pound solid visco-elastic memory foam, available in King, Cal King, Queen, Full, Twin, and Twin XL sizes. The memory Foam is antimicrobial and resistant to dust mites.