Winter swimming is the activity of swimming during the winter season, typically in outdoor locations (open water swimming) or in unheated pools or lidos. In colder countries, it may be synonymous with ice swimming, when the water is frozen over. This requires either breaking the ice or entering where a spring prevents the formation of ice. It may also be simulated by a pool of water at , the temperature at which water freezes. In Nordic countries of Europe as well in Eastern Europe (e.g. Ukraine, Russia, and Baltic countries), winter swimming is a traditional cultural element and part of religious celebrations like the Epiphany in Eastern Orthodoxy. Competitions for winter swimming also exist. Many winter swimmers swim with standard swimsuits rather than with wetsuits or other thermal protection. Famous ice and winter swimmers include Lynne Cox and Lewis Gordon Pugh. Also, many locations in North America and Europe hold polar bear plunges, commonly to celebrate New Year's Day, although participants are not expected to swim and generally most do not swim. International winter and ice swimming competitions take place around the world with two of the larger organizing bodies being the International Ice Swimming Association and the International Winter Swimming Association. Both organizations have similar competition guidelines including water temperatures typically below , a pool often cut out of frozen bodies of water, and swimmers limited to goggles, one standard bathing suit, and one latex or silicone cap - neoprene is not allowed. Maintaining the hole in the ice One way that the hole is maintained at regular ice swimming places is with a pump that forces the water to circulate under the hole, preventing ice from forming. Small ice-holes can also be kept open by keeping a lid/top over the hole to prevent ice forming. Most ice swimming places also use a specific heated "carpet" going from the locker rooms to the ice-hole, both to make walking to the hole more pleasant and for safety as otherwise the water dripping from returning swimmers would freeze and create a dangerously slippery surface to walk on. National traditions Northern Europe In Denmark, Estonia, Finland, Latvia, Lithuania, Norway, Russia and Sweden the ice swimming tradition has been connected with the sauna and Banya traditions. Unlike dousing, it is not seen as an ascetic or religious ritual, but a way to cool off rapidly after staying in a sauna and as a