Another book I read was Hugo Richard Sandberg's book "Hiihtourheilu Suomessa" from year 1891. This was the first book written in Finnish on skiing and skis. The book was written during a time when each region of Finland had their own ski design and only natural materials were used. I have only experience from fiberglass and plastic skis, but I dream from a day that I can effort to buy a pair of wooden skis (they cost around 400 per pair). Based on the book and some reports by Finnish Defence Forces from the WWII, I wrote following summary to help choosing a suitable pair of wooden skis. As English language lacks of some key words to describe parts of a ski and skiing weather, I have tried to explain them using other words.
Open. 8 to 9 feet long and 3 to 3½ inches wide skis are the best if you expect to run into different terrain during a journey. These are fast and lightweight if made from birch, but are not suitable for skiing in dense forest or in alpine terrain. The center of gravity should be set just in front of the bindings. The profile is shaped like flat, wide triangle. They are also known as Kajaani skis after the region where they were made during the late 19th century. It is quite interesting that Finnish Defence Forces used decades to develope skis that end up being very similar to the one presented here.
Forest. Skis for forest are wider and shorter than the others. So called Tavastia skis are only 6,5 feet long but 6 inches wide. Sandberg thinks that if made from a quite lightweight tree, such as Aspen, it would be almost perfect ski for hunters in cold and dry snow. I have to point out that during two tests arranged by the FDF, snowshoes outran skis in short distances in open terrain and also in forests when the snow was loaded with moisture. They were also better than skis to be used along with an ahkio. One can walk around 3-3½ km/h in virgin snow and 3½-4½ km/h in a snowshoe track with them. However if you have to climb a steep hill, it is better to have a ski pole with you to help you in climbing.