Selected according to the old tradition and ideally suited for use in the sauna. They are characterised by a delicate warmth. Split stones are the only material that can be used in saunas, heated with an electric or wood-fired stove. They can accumulate more heat and the water evaporates evenly from large planes. Appropriate shapes allow for a loose arrangement of stones. This is one of the most important factors in transferring heat from the heaters through the stones to the sauna. Good air circulation in the stone compartment guarantees the durability of the heaters.