Sunlight, freezing and everyday use will permanently damage the delicate finish of your leather upholstery and trim. Zymöl Treat Leather Conditioner is a solvent-free, banana-oil and collagen-based feeding product that releases trapped solvents and restores moisture to keep your leather looking, feeling, and smelling like new, and reduces remarkably the wrinkles just like on our skin, when we use collagen.