FLEXI PLY ( A FLEXIBLE FORM OF PLYWOOD) - Technology Student.PDF FILE - CLICK HERE FOR PRINTABLE WORKSHEET. Flexi ply is a form of plywood but it is extremely flexible. Thin marine plywood can be forced to form curves and bends, but eventually it will split, if pressured too far. Normal plywood tends to resist bending. However, flexi ply is composed of layers of thin plies.