Spa Sensations by Zinus Serenity 8" Memory Foam Mattress, Twin. EXPERTLY PACKED & SHIPPED – This mattress is compressed and rolled into one compact box that expands to its original shape once unboxed in 48 – 72 hours. WORRY-FREE WARRANTY – A 10-year limited manufacturer’s warranty is included with your purchase. See our entire assortment of https://www.walmart.com/m/brands/Zinus. REFRESHING FOAM LAYERS – Green tea and charcoal-infused memory foam promotes freshness, while layers of Zinus Comfort Foam® and Zinus Base Foam™ offer support for your joints PLUSH COVER – A soft and breathable knitted cover features beautiful embroidery for a stylish look and comfortable feel CERTIPUR-US® CERTIFIED – Highest quality foam is CertiPUR-US® certified for durability, performance, and content.