If the inside of your GORE-TEX garment feels damp, a leak could be the problem, or it could be time to renew the durable water-repellent (DWR) waterproofing. As the waterproofing on the outer material starts to wear off with increasing garment age, leaks can develop, particularly in the shoulder and upper back areas. Even though the inside layer of GORE-TEX remains watertight, liquid can then be sucked into the outside material, creating a feeling of dampness and causing a loss of heat. See the section on renewing the waterproofing.