Our leather collars are made with 100% genuine vegetable-tanned leather. Over time our leather will develop a patina. This provides character and personality to your accessory. The oil from your furry friend's skin will also soften the leather with wear. To increase the longevity of your leather accessory we recommend avoiding water immersion. Clean with a damp cloth and dry immediately. You may treat your accessory with a leather conditioner (this may affect the colour).