At the start of a hiking tour your circulation increases, which means your body is supplied with more blood and feet automatically expand. So, your feet change constantly and this depends on activity, temperature and time of day. The shoe/boot too changes during a hiking tour due to warmth generated when hiking, which means the material of the shoe warms up and expands. The correct lacing helps to achieve the perfect fit of the shoe in any situation. It probably goes without saying that buying the right shoe size is crucial. As a rough guideline it is recommended that you have a space of approx. 15-20mm in the toe area.