This is my second time ordering. I have two mats that are 4 years or so and only one has a leak. MN winters are long and lots of sand, gravel and salt are used on the roads which gets drug in the garage. The old mat still worked it just had a very small leak. In most cases it would not have been a big deal but we have living area under our garage and can't have ANY water leakage. These mats work very good. Defiantly will continue using.