Walking on hard roads is most unpleasant but sometimes unavoidable. More blisters are caused on experienced feet through this than perhaps any other cause. Walking on the verge of the road where it is usually softer can reduce the impact. Wandering from side to side can make the walk longer but if there is a camber on the road this may also make a difference. Changing from boots to more softly-padded sports shoes often helps, as does an extra pair of socks. Thicker wool–nylon knitted socks generally provide more comfort on hard roads than other sock types.