3 levels of waterproofing.
During the waterproofing test, we test 3 levels of waterproofing: 2000 flexes (around 2 hours of walking), 4000 flexes (around 4 hours of walking) and 8000 flexes (around 8 hours of walking). Of course, after this test or in use, the shoe regains its original waterproofing once dry.