A foldable windshield device for removable attachment to a T-top of a motorized watercraft includes: (a) a lower windshield portion including at least one lower attachment mechanism; (b) a foldable upper windshield portion including at least one detachable upper attachment mechanism; and (c) a waterproof, durable, flexible, substantially transparent hinge connecting the lower windshield portion to the upper windshield portion; wherein the upper and lower windshield portions are detachably attachable to poles of the T-top, and the upper windshield portion is detachable from the T-top and foldable over the lower windshield portion.