Abstract: A device including a micro component having an external surface and a permeable nanofiber covering on at least a portion of the external surface of the micro component. A cooled micro component system further includes a droplet spray system for spraying liquid droplets onto the nanofiber covering to cool the micro component. In an example method for cooling a micro component, droplet spray is directed onto a nanofiber covering that covers at least a portion of the micro component. The directing is controlled to permit efficient spreading and evaporation of liquid permeating the nanofiber covering. In example embodiments nanofibers of the permeable nanofiber covering are metalized to provide a rougher surface (e.g., a nano-textured metal layer).