DreamDNA 4lb King Size 4" American Made Visco Elastic Memory Foam Mattress Topper 4lb Density Memory Foam Instantly makes any mattress more restful, comfortable, supportive in sagging areas of your mattress 4 inches of soft yet supportive 4lb desnity temperature sensitive visco elastic memory foam conforms to your body American Made in the USA using enviromentally friendly processes. PURGreen Certified. Memory foam reduces pressure points that cause you to toss and turn, so you sleep better. Topper features a 4lb formula and a medium gel-like feel