The 13 oz. 96% Cotton / 4% Spandex twill weave allows for incredible range of movement while still giving you all the durability you need. Most other stretch work pants are 8 oz. cotton. The Cedar Flex Pants are the first true, heavy duty work pants at 13 oz. cotton. The double knee and rear heel panels offer added protection in high wear areas. These pants also offer plenty of storage space, with front pockets featuring a ledge to hang a knife or tape measure, rear patch pockets, signature utility front pocket and a rear utility welt pocket that fits most phones. The Cedar Flex Pants even have an updated, modern fit with a straight leg and a boot friendly work cuff. If durability and mobility are #1 and #1.01 on your list of importance, these pants are for you.