Our Horween leather is vegetable-tanned, imbued with natural waxes and oils, and the surface is not sprayed with a synthetic sealant, allowing it to develop a beautiful patina. For best care, use a quality leather conditioner. The Horween leather used in our cases is made in the traditional style dating back to 1905. Most leathers use synthetic tanning chemicals, synthetic dyes, spray paints and spray sealants to make a "perfect" surface. We don't think modern leathers are perfect. After so many synthetic treatments, it is hardly leather at all. We love real, old style American leather.