Today only, save 20% on Leesa Mattresses. Get the twin size Leesa 10″ Memory Foam Mattress in a Box, Luxury CertiPUR-US Certified 3 Layer Foam Construction for only $340. Our mattress: Great things come in small packages. The Leesa mattress in a box is beautifully designed with three premium foam layers for cooling, body contouring and pressure-relieving core support. With the all-new Top layer of high