Corozo comes from the tagua nut, gathered after it falls naturally from the palm. It dries for months, hardens, and only then is cut and polished — each button left with a different grain, like wood.
It takes dye without turning into shiny plastic, withstands the heat of an iron, and doesn't shatter when dropped. It ages into a matte sheen instead of whitened scratches.
It costs about six times more than the equivalent polyester. On a garment built to last ten years, it's the easiest sum to make.