Made of same revolutionary technology as our Memory Pillows. They provide equal distribution, superior pressure point relief and cervical alignment for optimum comfort. The visco-elastic foam is hypoallergenic, antibacterial, anti-fungal and ozone resistant. It reacts to the temperature of the body to form to you, giving proper support while maintaining softness. They are 2" of Memory foam bonded to a 1" Polyurethane base for rigidity. VitalFoam Memory 5lb Cushions (16x16x3") and 5lb VitalFoam Wheelchair seat cushions (20x20x3") have a blue cotton zippered cover (not the light grey pictured).