If your cushion has a vertical pattern, this entry is only helpful if the quantity of slipcovers is two or more. Entering the vertical repeat positions, multiple cushion patterns on the running length of the fabric, spaced to accommodate the extra fabric required for the vertical repeat to match the next pattern. NOTE: Sailrite does not cut fabric at a specific vertical repeat pattern when you order it, so you may want to order more fabric than what the calculator indicates, if the vertical repeat pattern is of paramount importance between multiple cushions.