Jeans are categorised by fit as: skinny, slim, straight, bootcut, taper, relaxed, flare and big & tall. Most of the adult denim jeans are identifiable by trademarked three digit style numbers. 501s are available in styles for both men and women, the rest of the 500 series are marketed for men and the 300, 400, 700, and 800 series for women, with the exception of 751s which are classic straight zip fly jeans.