The main purpose of a welding leather jacket is to shield the welder's upper body, arms, and torso from potential burns, sparks, and molten metal splatter generated during 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 and clothing.

Welding leather jackets typically cover the upper body and extend down to the waist or hip area. They are designed with ample room to allow freedom of movement while providing sufficient coverage for protection. Some models may include additional features such as reinforced stitching, high-stand collars for neck protection, and adjustable cuffs to ensure a secure fit.