"Castile" soap is thought to originate in the Castile region of Spain – thus the name Castile soap! Olive oil is a staple soaping oil that can be found in many cold process recipes. Olive oil contributes moisturizing properties to soap. It also gives the bars a gentle and creamy lather, making them an excellent choice for dry or sensitive skin. We handcrafted unique all-natural Olive Oil Soaps to increase the lather and give the skin additional benefits. Those are bars are super conditioning!!