Leather conditioners are chemicals used on a car's leather seats to replace the emollient oils found naturally in the leather. These oils make the leather supple, allowing it to bend instead of crack.
As car leather ages, it is exposed to body salts, ultraviolet light, heat and other environmental conditions that cause it to lose oils. Leather conditioner can be applied to the surface of the leather with a soft cloth or sponge. The leather conditioner should be applied several times a year, especially after cleaning, to maintain the quality of the leather. In addition to maintaining the leather's suppleness, leather conditioner imparts a soft shine to the surface of the leather.