Sails made with cross cut panels are the most economical sails to make because there is very little cloth waste. Sails made with Flex laminates are designed to be the least expensive laminate sail since they can be made with cross-cut panels without having to be reinforced with load-bearing tapes.
To understand the unique structure of Flex, one needs some background on sail construction. A cross-cut sail has all panels parallel to each other and perpendicular to the straight-line leech. This construction utilizes sailcloth that has the stronger fill yarns going across the panel instead of along the length of the roll of cloth, see inset in Diagram 1.