CamelBak's RaceBak is a revolution in lightweight wearable hydration. This quick-drying, breathable baselayer hides an innovative 70-ounce reservoir on your back beneath your jersey for aerodynamics and ease of use. The baselayer is sleeveless, has a full-length zipper, and uses flatlock stitching throughout for forget-about-it comfort. Your water stays cool thanks to the removable insulated back panel and tube cover, while the Hydropouch reservoir compartment stabilizes and supports the water weight on your back. Athletes rejoice—the next generation of hydration is here.