Zaino
Zaino products have been among the premium care products for years, and the polishes/sealers all have a little highlight: with the Zaino Z-FX infusion, the curing time of the polymers can be shortened so that you can apply a second coat faster.
Also worthy of special mention are the Z-6 and Z-8 gloss enhancers and spray sealants, respectively, and the Leather in a Bottle Z-10 - possibly the best-smelling leather care product in the world.