I want to know the difference! Hello, I'm studying french and i have one question that made me confused. 1 : J'ai achete une vest de cuir. 2 : C'est un foulard en soie. In those sentence, 'Cuir' and 'Soie', both of them are material. But why the first sentence used 'de' and the other used 'en'? Do they related to gender??