We made sure that your boots are waterproof by conducting laboratory tests to simulate walking with the boots half submerged in water. We also conducted field tests to measure wear and ageing. During the waterproofness test, we test 3 levels of waterproofness: 2,000 flexes (approx. 4 km walk), 4,000 flexes (approx. 8 km walk) and 8,000 flexes (approx. 16 km walk). This model of boot has been tested for up to 2,000 flexes, which is equivalent to 4 km of walking.