Firstly, it is said that CXL is one of the most complicated leather to make ; it undergoes at least 89 separate processes! This particular leather was developed about a 100 years ago by Horween Leather Company one of the oldest continuously running tanneries in the United States. CXL is calf leather that is chrome tanned first then vegetable retanned. The effect is a very durable pull-up leather (that lightens in colour when stretched) due to vegetable tanning altough very flexible because of the chrome tanning process. You get the best of both worlds! " Chromexcel is characterized by a rich pull-up in full aniline, hand rubbed finishes. Made to this day with old world craftsmanship, modern Chromexcel carries on a long history of superior comfort and durability " Shop the Chromexcel Selection.