Non-inflatable sports balls

1. A sports ball, comprising:

a surface layer comprising a plurality of panels; and

a lattice structure disposed below the surface layer,

wherein the lattice structure comprises elongate radially extending elements and elongate non-radially extending elements, wherein ends of the elongate radially extending elements and ends of the elongate non-radially extending elements are connected to each other to form a plurality of lattice cells, and

wherein at least the lattice cells which are adjacent to the surface layer have at least one dimension which is smaller than an average diameter of the panels.

2. The sports ball according to claim 1 , wherein at least the lattice cells which are adjacent to the surface layer have at least one dimension which is smaller than 5 cm.

3. The sports ball according to claim 1 , wherein at least the lattice cells which are adjacent to the surface layer have at least one dimension which is smaller than 3 cm.

4. The sports ball according to claim 1 , wherein at least the lattice cells which are adjacent to the surface layer have at least one dimension which is smaller than 1 cm.

5. The sports ball according to claim 1 , wherein the plurality of lattice cells forms a spherical lattice.

6. The sports ball according to claim 1 , wherein the lattice structure comprises a first spherical lattice shell and a second spherical lattice shell and wherein the first spherical lattice shell encompasses the second spherical lattice shell.

7. The sports ball according to claim 1 , wherein at least some of the lattice cells which are adjacent to the surface layer comprise a solid lateral wall.

8. The sports ball according to claim 1 , wherein at least some of the lattice cells which are adjacent to the surface layer comprise a solid inner wall.

9. The sports ball according to claim 1 , wherein at least some of the lattice cells which are adjacent to the surface layer comprise an expanded material.

10. The sports ball according to claim 9 , wherein the expanded material comprises expanded thermoplastic polyurethane.

11. The sports ball according to claim 9 , wherein the expanded material comprises expanded polyether block amide.

12. The sports ball according to claim 1 , wherein the lattice structure comprises a tetrahedral lattice cell.

13. The sports ball according to claim 1 , wherein the lattice structure comprises a lattice cell that is oriented perpendicular to a curvature of the sports ball.

14. The sports ball according to claim 1 , wherein the lattice structure comprises two or more lattice layers which differ in lattice geometry.

15. The sports ball according to claim 1 , wherein the lattice structure comprises two or more lattice layers which differ in material properties.

16. The sports ball according to claim 1 , wherein the lattice structure comprises at least one auxetic lattice cell.

17. The sports ball according to claim 1 , wherein the lattice structure comprises a first plurality of lattice cells and a second plurality of lattice cells, wherein the first plurality of lattice cells is larger in size than the second plurality of lattice cells.

18. The sports ball according to claim 1 , wherein the lattice structure is at least partly fabricated by one or more of 3-D printing, injection molding, and thermo-forming.

19. The sports ball according to claim 1 , wherein the complete lattice structure is integrally fabricated.

20. The sports ball according to claim 1 , wherein the lattice structure comprises a polymer material.

21. The sports ball according to claim 1 , wherein the lattice structure comprises at least one cavity.

22. The sports ball according to claim 1 , wherein the sports ball comprises an inflatable bladder.