What is ekoosh? Ekoosh is polyurethane foam mixed with powdered rubber. What makes Ekoosh unique is that the powdered rubber comes from old car tyres. Typically the volume of powdered rubber is around 16% of the foam.There is no loss of foam resilience and the use of the powdered rubber allows for good compressive and fatigue properties. Ekoosh still features anti-microbial inhibitors.