"08501-0042" is a product of Levi's in Japan which was released in 2008. The XXX9 denim is an evolution of the XXX17 denim used in "00501-01" and the XXX7 denim used in the "501-0101". The sewing is made in the Philippines. In the booklet accompanying the product, the XXX9 denim is explained as follows
XXX9 denim is a new denim that uses the company's traditions and techniques based on Cone Mills' material, and combines the "ultra-dark pure indigo" hue of 1909 with the composition "12.5 oz. unwashed and 14 oz. washed" found in the 1950s and early 1960s.
In order to express the unevenness of those days, the warp yarn is made up of a mix of four different thicknesses, and the weft yarn is made with a special ring span.
The XXX9 denim is a special denim with the original indigo color and the ability to replicate the strength and durability of a pair of jeans.
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