Memory Foam Mattress Toppers : Memory foam mattress toppers are an easy addition that still conform to your body to deliver a customized sleep experience. Free Shipping on orders over $45! Introducing the NEW 12 inch Cool-Breeze Gel Memory Foam Mattress taking memory foam comfort to the next generation! Made with 4-layer construction: 3″ Gel Foam, 4″ Cool Airflow Foam Support, 5″ High density foam for ultimate support base! The Milliard Portable Baby Crib Memory Foam Mattress Topper is designed to provide ultimate support and comfort for your little one in the portable crib. We designed our mattress using three highly specialized foam ingredientsthe best and finest in each category, our convoluted Certi-Pur high density foam, pure botanically derived natural latex foam, and premium memory foam. But, perhaps the most important ingredient was choosing just the right outer cover. .