Floatable sheet material and method of making

In a floatable on water, translucent heat laminated swimming pool cover being composed of a plurality of sections of plastic sheet material having a plastic embossed film with a plurality of embossments dispersed thereon except at the longitudinal edges thereof, said embossments being spaced apart and separated by land areas between said embossments, and a plastic backing film heat laminated to said embossed film at the said longitudinal edges and at said land areas, whereby air containing buoyant cells are formed by the embossments of the embossed film and the backing film, the improvement comprising fibrous material heat laminated to said sections of sheet material between the embossed film and the backing film at least at the longitudinal seam edges of each section, whereby said longitudinal seam edges are reinforced by the fibrous material and said reinforced longitudinal seam edges are attached by sewing to correspondingly reinforced longitudinal seam edges of another section of said sheet material and whereby substantially weakening of the attached sewed sections of sheet material at the seam edges thereof is avoided.