FXD WP.5 LIGHTWEIGHT STRETCH WORK PANT IS OUR LIGHTEST AND STRONGEST WORK PANT YET. THE ALL-NEW FXD WP.5 LIGHTWEIGHT STRETCH WORK PANT FEATURES A GROUND-UP DEVELOPED AND TESTED ADVANCED LIGHTWEIGHT STRETCH FABRIC MADE FROM A PROPRIETARY BLEND OF COTTON, POLYESTER, AND COOLMAX® FIBER.