The material is a cotton blend made mainly from American cotton, and the shape of the thread is long slub. It is woven on a power loom at the lowest possible speed (lowest speed) without tension to avoid damaging the fabric, resulting in a unique texture. UES jeans are not stone washed or processed in any way, so you can enjoy the fading right from the start. The best part of denim is how the look changes depending on who wears them. Please grow them into UES jeans with love. To enjoy growing them, it is important to first choose a silhouette you like. The 400-Z has a wide silhouette made of 17oz denim fabric, which is heavier than the standard denim. The thicker threads will result in a rougher color fade. The silhouette is even thicker than the 400-WW, which is the thickest denim from UES. The rise is also deep. The back pockets are slightly shifted to the left and right, which is a vintage detail, and is mainly intended to reduce damage to the back pockets when riding on a vehicle. It also incorporates classic details such as crotch rivets and a back cinch, making it a recommended pair of jeans for those who want to wear them hard. *We wash the item once before measuring and selling it. *Due to the nature of denim, fading and color transfer are unavoidable. Please wash separately. Also, the color may transfer (transfer) to light-colored items, so please be careful and enjoy the unique color fading of denim. (Examples of color transfer) White shoes, white shirts, white bags, white sofas, etc.