No(N)s are made of genuine leather with either smooth and shiny, or a bit coarser and dull surface.
Smooth and shiny leather
Take care of No(N)s made of smooth and shiny leather like you do for conventional leather shoes - clean them with a damp cloth and cover with a leather balm. We suggest a balm with oils and/or wax. Use a suitable spray for additional waterproofing.
Our dull leather is actually a waxed suede. Suedes always look best when fresh out of the box. To maintain the fresh look longer spray them with a water-repellent, which also helps to keep away the dust and dirt.
With the passing of time, the initial waxing slowly wears away and the surface becomes less smooth and "hairier", attracting more dirt and dust. With proper care the leather is cleanable and treatable and will look good (albeit a bit different) for longer. Treating the surface of the shoes will most likely darken the colour, but also deepen the shade, so it’s a feature rather than a flaw. Our own tests with cleaning, treating, and waxing have given pretty good results, therefore we can recommend the regular use of cleaners and treatments with wax-based agents.