The Copernicus Imaging Microwave Radiometer (CIMR) mission is dedicated to EU actions on safeguarding the Arctic and monitoring climate change as expressed by the EU Arctic Policy for a safe, stable, sustainable, peaceful and prosperous Arctic. It will carry a microwave radiometer to provide observations of sea-surface temperature, sea-ice concentration and sea-surface salinity. Uniquely, it will also observe a wide range of other sea-ice parameters. CIMR responds to high-priority requirements from key Arctic user communities.