Cools and refreshes. A small crystal placed on the sauna stones gives an amazing sauna experience. Add e.g. one crystal with a spoon on top of the stone and throw some tepid water - Enjoy the cooling and respiratory opening menthol scent - Suitable for flu season. The crystal melts on the rocks and releases a wonderfully fresh menthol scent into the air. It creates a cool bite of air, which is a fun contrast to the hot steam. Sauna ice is stored in a closed package in a dry place, out of the reach of children! Crystals must not be placed directly on the heaters in the stove, because they can catch fire because they are essential oil.