Examples described herein include socket covers with air impeding structures. In some examples, a processing unit socket cover comprises a base, an air impeding structure, and an engagement latch. The base may have a surface facing away from the socket and a perimeter defined by the surface. The air impeding structure may protrude from the surface and extend from a first side of the perimeter to a second side of the perimeter, diving the surface. The engagement latch may be connected to the air impeding structure to attach to the socket.