This technique can be used on moderate to steep slopes to ascend or descend safely by moving the skis up or down at 90° to the fall line. Keeping the legs flexed is important. Good control of weight transfer and edge control are vital on icy surfaces. Side stepping can be difficult in deep, fresh snow. A variation of the side step is the forward side step, with a forward and sideways step, at about 45–60° to the slope, which is a good way of ascending steeper slopes safely.