The Sera Perfect Sleeper Transform Medium Pillow Top Mattress combines support, pressure relief and cooling elements to give you a comfortable nights rest. Embrace the support and motion separation of the Individually Wrapped Coils. The exclusive HexCloud™ Gel Foam provides pressure relief while it relieves pain. Feel the coolness of the CoolFeel™ Fabric cover as you settle into bed. Additional cushioning from layers of Serta® PillowSoft™ Foam, adds to the soft feel. This Medium Pillow Top mattress is good for a side or back sleeper.