A control module for an electrical stimulation system includes an electronic subassembly and a connector assembly coupled to the electronic subassembly. The connector assembly defines a port suitable for receiving a proximal end portion of an electrical stimulation lead. The connector assembly includes connector contacts coupled to the electronic subassembly and open to the port. The connector contacts are suitable for coupling to terminals disposed along the proximal end portion of the electrical stimulation lead when the electrical stimulation lead is received by the port. A covering is conformably disposed over the electronic subassembly and the connector assembly. The covering has an inner surface, an outer surface, and multiple layers.
