In a tweet Monday, the Grand Canyon NPS showed how excessive heat can cause the glue holding hiking boots to melt, making the shoe fall apart.
This warning comes on top of additional concerns about extreme heat in the West.
Temperatures in the Grand Canyon are predicted to hit 112 degrees Fahrenheit Wednesday.
"Temperatures can be vastly different on ridges and mountains than down in canyons and valleys," says CNN meteorologist Haley Brink.