Choose from the available sizes. Firm high-quality memory foam mattress. 15 in. thick with memory foam top layer. Foam-encased border prevents drooping when sitting on the side. Pocketed coil construction provides disturbance-free sleep. The Milton Greens Stars Superior Comfort 15 in. Memory Foam and Pocketed Coil Hybrid Mattress is the ideal choice for bedtime comfort. This mattress has a soft memory foam top and a foam border for extra support. The pocketed coil construction ensures that each person in bed gets a disturbance-free sleep. This mattress comes in your choice of available sizes. Size: California King.