In a word, “patina”, because product like this only gets better the longer it’s lived in, played in, and worked in. Taking on the shape of the wearer and the effects of wear + tear + the nature that happens, this is the type of jacket that only gathers more soul as time goes on. The wax-impregnated fabric is what enhances this evolution, although it’s the type of wax that is dry, not sticky or oily to the touch, and never needs replacement. You only know the wax is there because of the wrinkles the fabric will hold and the hi-low that will develop over time. Relwen’s recommendation, treat it like rigid denim... never wash it, or only inside-out and as lightly as possible.