The most popular feature at Division Bath is the traditional Russian Banya or hot room. These rooms (one on either side) are built of concrete and tile with glass doors. In a corner of each is a brick oven in which granite boulders, approximately the size of watermelons, are heated to extreme temperatures by gas jets; hot water is then thrown on the rocks by the customers as desired. When this happens, the water instantly evaporates, creating steam inside the oven and heating the brick enclosure, thereby raising the air temperature in the room. This method provides a much dryer heat than common steam rooms. The bathers sit or lay on three-level tiered wooden benches, which allow for dramatically different temperatures at the various heights. Cold water is provided by taps located under the benches - when overwhelmed by the heat, a bather may dump a bucket of frigid water over his head while still in the hot room, or may step outside to use the cold pools.