Hiroya Minakuchi / Mittens being illuminated by light, Monument Valley Navajo Tribal Park, Arizona

Diane McAllister / Japanese Macaque (Macaca fuscata) foraging for food in deep snow, front paws covered in snow, Jigokudani, Japan, January

Tim Fitzharris / Mittens, North Window, Monument Valley, Arizona

Tim Fitzharris / Moon over mittens, Monument Valley, Arizona

Tom Vezo / East and West Mittens, Monument Valley, Utah

Tom Vezo / Mittens at sunrise, Monument Valley Navajo Tribal Park, Arizona

Bryan and Cherry Alexander / Nenets girl, warmly dressed in reindeer skin clothing, carrying snow to melt for water. Yamal, Northwest Siberia, Russia, February 2007. Editorial use only.

Bryan and Cherry Alexander / Man demonstrating the layers he wears to keep warm (underwear, mid layers, outer layer, jacket & mittens) Antarctica, January 2006. Digital composite.

Steven Kazlowski / West and East Mitten buttes silhouetted at sunset, Monument Valley, Navajo Tribal Park, Arizona, USA. February 2009.

Steven Kazlowski / West and East Mitten buttes silhouetted at sunset, Monument Valley, Navajo Tribal Park, Arizona, USA. February 2009.

Staffan Widstrand / Traditional inuit kayak with polar bearskin mittens and seat cover, Qaanaaq, NW Greenland, 1996.

Philippe Clement / The Mittens at dawn, Monument Valley Navajo Tribal Park, Arizona, USA May 2007