Brooks Green Silence - Put your best running foot forward and reduce your carbon footprint in style with the Green Silence by Brooks. Help save the planet one mile at a time!Biodegradable foam collar provides plush comfort. Compression Molded Process (CMP) is a no-waste midsole manufacturing method in which pellets of material are pressed together into a mold. This system requires fewer steps, less energy and more consistent results. BioMoGo midsole provides long-lasting cushioning and is also environmentally friendly.