Gore-Tex two layer waterproof, windproof and highly breathable fabric is tough enough to hold back a column of water over 30 metres high (i.e. the hydrostatic head is 30,000 mm which is the best in the business, ensuring longevity and excellent performance over many years). This garment is engineered according to Gore's scientific research, manufactured with high performing materials and put through rigorous tests. The garment is easy care and can be washed in a domestic washing machine. The Gore-Tex guarantee doesn't just cover the fabric; they guarantee the performance of the entire garment. If you are not entirely satisfied with the waterproofness, windproofness or breathability of your Gore-Tex outerwear, they will repair it or refund your purchase price. This guarantee does not affect your statutory rights. For more details please visit gore-tex.com/guarantee.