STYLE MASTERS smooth shampoo for straight hair 400 ml STYLE MASTERS smooth shampoo for straight hair 400 ml is a gentle shampoo designed specifically for straight hair. It is made with natural ingredients like olive oil, argan oil, and ginseng root extract that help to nourish and protect your hair. This shampoo is free from sulfates, parabens, and silicones, making it a great choice for those looking for a natural, gentle shampoo. It also helps to reduce frizz and add shine to your hair.