David Woodfall / Residents walking through February 2014 floods from River Thames, Wraysbury, Surrey, England, UK, 16th February 2014.

Chris O'Reilly / Honey fungus (Armillaria mellea) mature, fruiting bodies on a fallen tree with person walking, Mixed woodland, Autumn, Derbyshire, UK, October

Philippe Clement / Hiking boots drying out in tundra, Denali NP, Alaska, USA.

Ashley Cooper / Climber with spindrift during high winds moving snow above Grasmere, Lake District, England, UK. December 2010

Ashley Cooper / A climber being blasted by spindrift during high winds moving snow above Grasmere, Lake District, UK. December 2010

Ashley Cooper / Climberwith spindrift during high winds moving snow above Grasmere, Lake District, UK. December 2010

Ashley Cooper / Climbers in spindrift during high winds moving snow above Grasmere, Lake District, UK. December 2010

Jouan Rius / Legs and walking boots next to Desert Prickly Pear Cactus (Opuntia sp) with pink flower , Grand Staircase-Escalante National Monument, Utah, USA, May.

Oriol Alamany / Hiker Eulàlia Vicens disinfecting her boots before entering Little Island trail, Lord Howe island, Lord Howe Island Group UNESCO Natural World Heritage Site, New South Wales, Australia, October 2012....

Juan Carlos Munoz / Farmer at sheepdog trial in Caitins, Iveragh Peninsula, County Kerry, Republic of Ireland. September 2015.

Juan Carlos Munoz / Farmer at sheepdog trial in Caitins, Iveragh Peninsula, County Kerry, Republic of Ireland. September 2015.

Eric Baccega / Young Nenet boy at camp wearing traditional winter boots made with reindeer skin. Reindeer (Rangifer tarandus) and sled in background. Yar-Sale district. Yamal, Northwest Siberia, Russia. April 2016.

Kirkendall-Spring / Boots and gators left out to dry at Walbran Creek Camp, along the West Coast Trail, Pacific Rim National Park Reserve, British Columbia, Canada, May 2015.

Pal Hermansen / Waymarker on hiking trail in the mountains, Norway, September 2010.

Kirkendall-Spring / Hiker's feet in boots walking across the Plains of Abraham on the Loowit Trail #216 in Mount St Helens National Volcanic Monument. Washington, USA, August 2011.

Kirkendall-Spring / Hiker's legs and boots crossing the Plains of Abraham on the Loowit Trail #216 in Mount St Helens National Volcanic Monument. Washington, USA, August 2011. Model released.

Kirkendall-Spring / Hiker's feet in walking boots on the Observation Peak Trail #132 in the Trapper Creek Wildernes. Washington, USA, August 2011. Model released.

Niall Benvie / Hiking boots on the move. Scotland. Model released

Ernie Janes / Walker walking through Cowslips (Primula veris) in wildflower meadow, UK

Ernie Janes / Yellow Labrador retriever puppy, studio portrait with hiking boots and leash

Ernie Janes / Yellow Labrador retriever puppy chewing hiking boots

Ernie Janes / Yellow Labrador retriever puppy chewing hiking boots

Stephen Dalton / Emperor / Giant African scorpion (Pandinus imperator) on boot, to demonstate scale

Wild Wonders of Europe / Munier / Rucksack and walking boots for camping expedition outside wooden building with grass roof, Forollhogna National Park, Norway, September 2008

Wild Wonders of Europe / Munier / Rucksack and walking boots for camping expedition outside wooden building, Forollhogna National Park, Norway, September 2008

Nick Turner / Close-up of walker's legs and walking boots at Llyn y Fan Fach, Brecon Beacons National Park, Powys, Wales

Nick Turner / Close-up of hiker's boots at Llyn y Fan Fach, Brecon Beacons National Park, Powys, Wales

Nick Turner / Walkers boots and view of Fan Hir escarpment, Brecon Beacons National Park, Powys, Wales

Gary K. Smith / Walking boot about to damage Cowslips {Primula veris} in mature pasture, Norfolk, UK, April

Gary K. Smith / Person walking over and damaging mature Cowslip pasture {Primula veris} Norfolk, UK, April

Nick Turner / Hiking boots on a forest trail, Espiritu Santo, Vanuatu, Melanesia

Pete Cairns / Legs of walker at a trailmarker, Wester Ross, Scotland, UK.

Niall Benvie / Hiking boots close-up

Niall Benvie / Close-up of walking boots, moorland in Scotland, UK

Kirkendall-Spring / Hiking boots outside a tent, Ferry Basin, Bailey Traverse, Olympic National Park. Washington, USA, August.

Kirkendall-Spring / Hiking boots outside a tent, Ferry Basin, Bailey Traverse, Olympic National Park. Washington, USA, August.