To use an item that exists in FR: The Boots of the Winterlands. They let you travel on ice/snow, without leaving tracks, and also allow you to move at full movement speed in either case. It sounds like your boots would duplicate the first part of the effect, but in any terrain. However, not leaving tracks as a magical is completely unrelated to movement speed (because you can move at half-speed to leave less tracks). It seems to me that what you are wanting is for the boots to have "Freedom of Movement" in addition to "Pass without Trace". Those would be some very nice boots indeed. Hmmm...