Esquí de fondo
Nordic or cross country skiing is a mode of transport in Nordic countries, where the ground is covered in snow throughout most of the year. Prior to this method people used special snow shoes but these would get buried in the snow and impede progress along the roads by creating holes and obstacles.
They needed something to tred a larger area of snow to avoid sinking in, so the skis were created, this also provided the sliding element which not only showed to be more effective than the snow shoes but added speed to travelling along the roads. The flat waterproof base of the ski enabled people to slide over ice as well as snow, the elongated shape meant that they were easy to walk with and the impulse given from the long poles could speed up the whole process.