Our two new shades, Iron-Dyed black and Oiled Leather are simple, naturally-derived colors—a mineral pigment and plant-based oils. Nothing weird or synthetic, and no hard-to-pronounce chemicals. Both last really well over time, and can be re-conditioned at home if they lighten with wear. For now, our Iron-Dyed & Oiled Leather styles are released in limited quantity small batches. They're made-to-order right here in San Francisco (by us), so get a pair while each batch is live!