The magic focused in the soles of these boots enable you to traverse ice and snow as if it were solid, non-slippery ground. You ignore difficult terrain created by cold conditions.
When traveling over snow, you leave only 1/2-inch deep footprints, enabling you to walk over deep drifts without the dangers of falling in. Similarly, you can step onto a floating chunk of ice without fear of tipping it over, although jumping onto the ice will “push” it in the direction of the jump.