it is not silky I know that much, but again I really cannot answer the question without being at home to check it out I don't want to say its cotton then it turns out to be lycra, or vice versa. Im really sorry I cant give you more info than that...... I only wore it like one time a year or so ago, and just took a picture of it and put it back in the closet....... didn't pay enough attention to remember what it is. Again Im sorry I cant be more specific.