PD Pillows Office Chair Gel Memory Foam Cushion Grey & White 16" X 16" X 3.5/2" This Cushion is Made with Cooling Gel and Memory Foam for Ultimate Comfort. Minimizes sweating with the Cooling Gel Technology. Make Your Chair Ergonomic with This Incredibly Comfortable Contouring Memory Foam Pillow. This product has cooling gel foam technology originally designed for Nasa.