Authentic Stretch Shorts by Vans. The Authentic Stretch Short is a 68% cotton, 30% polyester, and 2% elastane 7.8 oz. Sturdy Stretch twill chino short that utilizes a unique blend of engineered fibers to provide comfort and increased durability with exceptional shape and stretch retention. The Authentic Stretch Short also features front slash pockets, back welt pockets with a button closure, a woven Vans label, and a medium rise, modern fit.