On the other hand, saunas rapidly raise body temperature from the skin surface through high-temperature air or steam. Especially in Finnish saunas, where temperatures can exceed 80°C to 100°C, profuse sweating is promoted in a short period. This rapid temperature change and sweating, when combined with "hot and cold therapy" (alternating between hot and cold environments), is said to improve blood circulation and regulate the autonomic nervous system. Löyly (pouring water over hot sauna stones to create steam) can further increase the perceived temperature, making it suitable for those who seek a stronger stimulus.