My friend invented a zipper slider that repairs zippers without tools. We have sent some to the military for field testing but think that your climate is a perfect test. To see hoe it works go to our web site at http://flipanzip.com You may never break a zipper again if this is original equipment on you jackets. It is easily removable and put back on without breaking teeth. It even can go over missing teeth for a temp repair. Hope this info helps.