As with most small businesses, we try really hard to get things right the first time. We double check orders, we measure twice and cut once, but occasionally mistakes happen. And sometimes, our customers make mistakes ordering their covers.(No, 12-15 meters is not the same as 12-15 feet! ). SO we have set up some policies to make it easier for all of us to understand what our responsibilities are, in case of a mistake. Our warranty...If your cover fails within the first 90 days after you receive it due to a defect in materials or workmanship, we will replace it at no charge to you. For more detailed information about returns because 1) you measured wrong 2) we measured wrong or 3) you just changed your mind, please go back to our main site and the page that says " Warranty and Returns". Any items returned for other than warranty issues must be returned to us within 30 days, in a" NEW AN UNUSED CONDITION".