AmericanMade DreamDNA Twin XL 12" Mattress With 4" Gel Infused Visco Elastic Memory Foam GEL Memory Foam Instantly makes this mattress more restful, comfortable, cooler and supple yet supportive than traditional memory foam mattresses. 4 inches of soft yet supportive Gel Infused memory foam conforms to your body and provides pressure point releif while the supportive base layer ensures proper spinal alignment. Made in the USA using enviromentally friendly processes. PURGreen Certified meeting all CSPC and EPA guidelines. Gel Infused Memory foam reduces pressure points that cause you to toss and turn, so you sleep better redusing motion transfer from one sleeper to another. Mattress features a Gel Infused formula and a medium gel-like feel with a Medium Firm Polyurethane base.