The main purpose of a welding leg guard is to protect the welder's lower legs and feet from potential burns, cuts, and injuries caused by exposure to the intense heat and hazards associated with welding processes. Welders often work in close proximity to high-temperature welding arcs, which can emit sparks and spatter that pose risks to exposed skin, including the lower legs and feet.

Welding leg guards typically cover the lower portion of the legs and feet, extending from the ankles to just below the knees. They are designed to be worn over the welder's regular work boots or shoes. Some models may have additional straps or fasteners to secure the leg guards in place and ensure a comfortable fit.They are an essential part of the welder's PPE ensemble, along with other protective gear such as welding helmets, goggles, welding jackets, gloves, and aprons.