Hardly anyone has the house really flat ground. Most curbs and / or paving slabs are a bit high. Then you pop each time with the aluminum edge of Gottschee fox before and freezes. It's annoying in the long run and one longs for this soft rubber lip. Too bad they will not be delivered on snow fox. Most users need those thick lip necessarily. This lip more snow is taken. A thin layer of ice can not get away. Both snow fox, and this lip I can highly recommend.