Heat-resistant boots and overboots protect against extreme heat and burns. They are typically made of leather, which can withstand temperatures up to 450 degrees Fahrenheit. Their soles can be made of polyurethane or rubber, which are designed to resist shock, abrasion, acid and oil and provide a good grip on wet or slippery surfaces. Heat-resistant boots and overboots are used in foundries, arc welding and maintenance work. They may have steel toes to protect against compression and injury from falling objects.