Gore-Tex guarantees the waterproofness of their product for the life of said product.
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"How does the replacement process work?
In some cases your fastest and simplest source for replacement may be your local retailer. If that doesn’t work for you, we can help. Once it has been established that a replacement is the best option for you, a conversation occurs between you and your GORE-TEX® consumer service advisor to identify the best replacement products. We will gather the necessary information to help you make the right selection and ensure the replacement’s fitness for use. We seek to replace the item returned with a product of the same or a similar end use. Upon request, the advisor can seek out replacement options for you based on what you have shared with us, the prescribed price, and the end use. You also have the option of getting back to us with a selection you have identified for yourself, based on that same criteria."