koivuasu

Koivuasu is a Finnish term that translates to "birch sauna." It refers to a traditional type of sauna where birch branches are commonly used for various purposes. The most prominent use of birch in a koivuasu is the vihta or vasta, a bundle of fresh birch twigs and leaves that is used to gently beat the skin during a sauna session. This practice, known as "havuja" or "vasominen," is believed to improve circulation, cleanse the skin, and provide a pleasant aroma.

The wood used for the sauna's construction might also be birch, though pine and spruce are more common due to their durability and resistance to heat and moisture. The aromatic properties of birch, especially when heated, contribute to the unique sensory experience of a koivuasu. The fragrance released from the leaves and twigs is a significant part of the sauna ritual for many.

Beyond the vihta, birch can also be used for benches or other sauna accessories. The cultural significance of birch in Finland is deep-rooted, often associated with health, cleanliness, and well-being. Therefore, a koivuasu embodies a connection to nature and traditional Finnish customs. The term itself evokes images of a serene, natural environment where the benefits of the sauna are enhanced by the presence and use of birch.