In a March 22, 2017 photo, Ellen Gallant changes out from her new mountaineering boots, following an afternoon of hill repeats on Snow King Mountain in Jackson, Wyo. The boots feature a built-in heating system for sub-zero temperatures at the summit of the 29,029-foot peak.,Gallant is training to return to Mount Everest for third climb (Ryan Dorgan/Jackson Hole News & Guide via AP)
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