Mountain Khakis Men 307 Jean - Slim Fit. Observe excellence in denim. More than just a jean, the 307 is a stylish beast made of organic, stretch selvage denim. Which means you care about looking good and feeling good in all the best of ways. Hidden within are Mountain Khakis camo pocket bags and special twill tape on the fly panel, your secrets to be revealed. Here is a secret for you, we named the 307 after the Jackson area code (it is actually the same for the entire state of Wyoming). Special Mountain Khakis red stitch accents throughout. Diamond-shaped action gusset. 99% organic cotton/1% spandex. Multiple Fits (Slim Tailored Fit and Classic Fit).