Welding gloves take an absolute beating. They are exposed to extreme radiant heat, molten spatter, and constant abrasion against rough metal. Most high-end welding gloves are made from heavy elk, cowhide, or pigskin. Because the leather is so thick to provide thermal protection, it has a bad habit of drying out, stiffening up, and turning into something that feels like a cardboard box after just a few weeks of use. Once the leather gets that stiff, the welder loses all dexterity, and the gloves end up cracking and failing. Keeping them supple requires a very specific routine that goes against how you treat normal work gloves.
You cannot treat welding gloves with standard leather conditioners like mink oil or standard boot grease. If you coat a welding glove in heavy oil and then hold it near a 300-degree weld puddle, that oil will literally fry. It will heat up, burn the welder's hands, and create a horrible, acrid smoke. Furthermore, heavy oils will clog the pores of the leather, ruining its natural breathability and making the glove sweat excessively.
To keep thick welding leather flexible without turning it into a fire hazard, you need to use a product specifically designed for heat-resistant leather, which is usually a blend of lanolin and natural beeswax, often sold as "wax-based leather dressing." You only apply this treatment when the gloves are completely dry. If you try to wax damp gloves, you lock the moisture inside, which will rot the stitching.
Take a small amount of the wax dressing-less is more-and work it into the leather using your hands, paying special attention to the deep creases at the knuckles and the base of the thumb where the leather folds the most. Do not put the wax on the palm pads. The palm pads are usually made of a different, denser leather or have an extra heat-resistant layer, and waxing them just makes them slippery when holding a stinger or a MIG gun.
Once you apply a light coat, do not put the gloves near a heater to dry. Set them in a warm, dry room with normal ambient temperature and let the leather slowly absorb the wax overnight. The wax acts as a lubricant for the leather fibers. When the glove bends, the fibers slide over each other instead of breaking. Done once a month, this process will easily double the life of a fifty-dollar pair of welding gloves and keep them feeling like an extension of your hand rather than a rigid barrier.