Footwear with a lace fastening includes an opening with a first edge and a second edge. A WGS catalyst of the invention may have the following composition:a) at least one of Pt, Ru, their oxides and mixtures thereof;b) Na, its oxides or mixtures thereof; and optionally,c) Li, its oxides and mixtures thereof. The bias generator is configured such that the bias voltage andor bias current varies as a function of a junction temperature of the MOS device.