The Cassatt hybrid mattress delivers next-level comfort with 4 centimeters of Indulge Memory Foam for pressure relief and IntelliCoil HD for perfect support. The IntelliCoil HD support system is a one-of-a-kind innerspring design with densely packed coils that provide even more adaptive support. The stretch-knit covering with Tencel is designed to wick away moisture and keep you comfortable, while the ventilated coil system works with external air vents to increase breathability and promote cool sleep. The firm comfort level is ideal for back and stomach sleepers. This mattress is compatible with 9” and 5” Sterns and Foster foundations.