Honestly, not well. All hydration tubes will freeze up if not insulated (i.e. used with a pack that places the hose within the shoulder strap, thereby insulating and warming it with your shoulder). But this one actually delaminated after being frozen and thawed. I could see flakes of plastic flapping in the hose, and cracks developed on the inside curves. I also had the leaking problem mentioned in a review on this page. Love my drom, hate the hose, especially in winter.