The lasting process is where the shoe begins to take shape. The upper of the shoe is tacked to the back of the last to ensure the back height is correct. It is then pulled over at the, before being side lasted by hand. It is vital for the toe to be latest to ensure that the shoe upper is fitted accurately to the last. The shoe upper is pulled over the "last" and attached to the insole at the toe, sides and seat. Before lasting, the uppers are "mulled" (conditioned) in a special room in order to impart sufficient moisture to allow the leather to mould to the shape of the last.