Cover: 97% Polyester, 3% Spandex. Fill: Visco Elastic Polyurethane Foam - Weight: 1050gms The Air. Flex Pillow by Odyssey Living combines a quickresponse core with contouring comfort of memory foam. The result is a softer flexible feel, whilst still enjoying the therapeutic support of memory foam creating the perfect balance of comfort & support. Thermoregulating holes in the memory foam core creates ventilation & airflow for a cooler sleep.