For an ideal sauna experience, the wood needs to be able to expand and contract with the high temperatures.
Excessive use of nails and other fasteners can result in split wood. The ball-and-socket assembly of a barrel sauna lets the wood expand and contract within the steel bands, creating a tight seal that won’tshatter.
Sauna places the human body in hot and humid air, which accelerates the blood circulation and metabolism, and improves the functions of tissues and organs of the whole body, including brain, heart, liver, spleen, muscle and skin.