GORE-TEX® garments are not harmed by washing. On the contrary this will prolong the life of the garment. Normal washing instructions for GORE-TEX® garments are:
Remember to close all zippers and Velcro. The garment should be washed at 40 degrees, with a mild detergent and no softening or rinsing agents. Do not use bleach. Softeners, rinsing agents and bleaches can damage the fabric's water-resistant properties (not the membrane/waterproofing) and the color of the fabric. Rinse the garment twice, if possible. Use water repellent spray on the outside of the garment after washing for optimal water-resistance (this has nothing to do with the waterproof quality of the garment, but makes it easier for water to roll off the outer fabric). Dry the garment on a low setting in the dryer, if you like, or iron it at a low temperature. Warmth helps to reactivate the waterproofing. The garment must be dry before washing and before being put away.
All GORE-TEX® products have water repellant (DWR Durable Water Repellent treatment) when they are new. This treatment prevents the fabric from attracting moisture and dirt, while simultaneously giving optimal moisture vapor transportation to the fabric. Over time, the water repellency will be worn away. This will take place especially in vulnerable places like the seat, knees, shoulders and elbows. To optimize the product´s abilities, it should be re-impregnated after each wash, or when the water repellency is not performing optimally. For water repellency treatments, we recommend the use of this environmental friendly spray or other environmental friendly water repellents. Spray re-impregnation ensures that only the outer side of the garment will be water repellent, which optimizes the moisture transportation of the product.