Ortho Mattress 6 Inch Visco-Elastic Memory Foam Mattress - CertiPUR-US Certified - 10 Year Warranty - Built in USA - Twin Profile 6" Visco-Elastic Memory Foam (Twin) CERTIPUR-US SUPPORT FOAM (4.5") - Employing the most rigorous certification process to satisfy the health conscious customer. Our foams are made with no ozone depletes, mercury, lead, formaldehyde, or heavy metals to achieve low emissions for indoor air quality. MEMORY FOAM - Visco Elastic Memory foam provides enhanced pressure relieving qualities that tailor the mattress to all body types and sleeping positions. Our Memory foam ensures that your body weight is evenly distributed across the mattress to avoid numbness and low blood circulation. 10 YEAR NON-PRORATED WARRANTY - We stand by our product by offering a manufacturers warranty that covers the full credit of your purchase throughout the entire ten years, rather than having your investment depreciate annually with a prorated warranty. DESIGNED AND BUILD IN THE USA - The brand "Ortho Mattress" has been around since 1957. All of our mattresses are designed and built locally in our Southern California manufacturing facility. As a family owned and operated company, we take pride in the fact that all of these beds are only at Ortho Mattress!