Abstract: Provided is a leak-free American football, which has a polyurethane foam having a shape of an American football; a covering formed on an exterior surface of the polyurethane foam and having a seam; multiple pairs of lacing holes formed in the covering along two opposite sides of the seam, and a lace passing through the multiple pairs of the lacing holes to close the seam, such that the polyurethane foam is covered by the covering and the lace. Since the polyurethane foam is solid and elastic, the leak-free American football can maintain a desired size, shape and bounce without the need for inflation, thereby improving the stability and durability.

Abstract: A ball with a foam carcass has an inner bladder, a winding layer, a foam carcass layer, a colored rubber ink layer, and a leather layer. The inner bladder is hollow. The winding layer is attached to and covers the inner bladder. The colored rubber ink is brushed on and covers the foam carcass layer. The foam carcass layer with the colored rubber ink layer with the colored rubber ink is attached to and covers the winding layer to form a foam covered carcass. The foam covered carcass is vulcanized. The colored rubber ink layer covers the uneven foam-carcass layer to form an even foam covered carcass. The leather layer is attached to the foam covered carcass.