Flotation device

1. A flotation device for aiding a swimmer in a body of water, the flotation device, comprising:

a body formed from an extruded foam and comprising:

a top surface,

a bottom surface,

a first side rail,

a second side rail,

a leading lateral surface, and

a trailing lateral surface,

wherein the leading and trailing lateral surfaces are cut surfaces and the first and second side rails are extruded surfaces,

and wherein the extruded foam is a flexible cellular foam.

2. The flotation device of claim 1 , wherein the extruded foam is a flexible cellular organic polymeric material configured to not rupture within 60 seconds when a specimen of the flexible cellular organic polymeric material with dimensions of 8 inches by 1 inch by 1 inch is bent around a 1 inch diameter mandrel at a uniform rate of one lap in 5 seconds in the form of a helix at a temperature between 65 and 85 degrees Fahrenheit.

3. The flotation device of claim 1 , wherein the flotation device includes a longitudinal dimension greater than a lateral dimension.

4. The flotation device of claim 1 , wherein the flotation device has a longitudinal stiffness along the longitudinal axis of the flotation device greater than a lateral stiffness along the lateral axis of the flotation device.

5. The flotation device of claim 1 , wherein the leading lateral surface is shaped so as to be a reciprocal shape of the trailing lateral surface.

6. The flotation device of claim 1 , wherein the body further comprises:

a top skin,

a bottom skin,

a first side rail skin, and

a second side rail skin.

7. The flotation device of claim 6 , wherein the top skin, the bottom skin, the first side rail skin, and the second side rail skin are configured to be substantially impermeable to fluids.

8. The flotation device of claim 7 , wherein the skins are formed from the foam material during an extrusion process.

9. The flotation device of claim 1 , wherein the flotation device is configured to have a lateral curvature when viewed in cross section that extends across the top surface and bottom surface of the flotation device.

10. The flotation device of claim 9 , wherein the flotation device is configured to have a plurality of curves that extend across the top surface and bottom surface of the flotation device.

11. The flotation device of claim 10 , wherein the lateral curvature that extends across the top surface is shaped so as to be reciprocal of the lateral curvature that extends across the bottom surface.

12. The flotation device of claim 11 , wherein the plurality of curves includes:

at least a central curve, and

at least two perimeter curves.

13. The flotation device of claim 12 , wherein the curvature of the central curve opens in an opposite direction from the curvature of the at least two perimeter curves.

14. The flotation device of claim 13 , wherein the width of the curvature of the central curve is greater than the width of the curvature of the at least two perimeter curves.

15. A flotation device, comprising:

a body formed from an extruded foam and including:

a leading lateral surface having a shape;

a trailing lateral surface opposite the leading lateral surface and having a shape;

a first surface traversing the body and extending from the leading lateral surface to the trailing lateral surface;

a second surface on an opposite side of the body from the first surface and extending from the leading lateral surface to the trailing lateral surface;

a first longitudinal side rail extending from the leading lateral surface to the trailing lateral surface and from the first surface to the second surface; and

a second longitudinal side rail on an opposite side of the body from the first longitudinally extending side rail and extending from the leading lateral surface to the trailing lateral surface and from the first surface to the second surface,

wherein the leading and trailing lateral surfaces are cut surfaces and the first and second surface and the first and second longitudinal side rails comprise extruded surfaces.

16. The flotation device of claim 15 , wherein the shape of the trailing lateral surface is reciprocal of the shape of the leading lateral surface.

17. The flotation device of claim 15 , wherein the second surface has a shape that is reciprocal of the first surface.

18. The floatation device of claim 15 , wherein only the first surface, the second surface, the first longitudinal side rail and the second longitudinal side rail comprise an integral skin formed from the extruded foam.

19. A flotation device, comprising:

a body formed from an extruded foam and including:

a leading lateral cut surface having a shape;

a trailing lateral cut surface opposite the leading lateral surface and having a shape;

a first extruded surface traversing the body and extending from the leading lateral cut surface to the trailing lateral cut surface, wherein the first extruded surface comprises an integral skin formed from the extruded foam;

a second extruded surface on an opposite side of the body from the first extruded surface and extending from the leading lateral surface to the trailing lateral surface, wherein the second extruded surface comprises an integral skin formed from the extruded foam;

a first longitudinal side rail having an extruded foam surface extending from the leading lateral cut surface to the trailing lateral cut surface and from the first extruded surface to the second extruded surface, wherein the extruded foam surface of the first longitudinal side rail comprises an integral skin formed from the extruded foam; and

a second longitudinal side rail having an extruded foam surface on an opposite side of the body from the first longitudinally extending side rail and extending from the leading lateral surface to the trailing lateral surface and from the first surface to the second surface, wherein the extruded foam surface of the second longitudinal side rail comprises an integral skin formed from the extruded foam.

20. The flotation device of claim 19 , wherein the trailing lateral cut surface is reciprocal of the leading lateral cut surface.

21. The flotation device of claim 19 , wherein the flotation device is configured to have a lateral curvature when viewed in cross section that extends across the top surface and bottom surface of the flotation device.

22. The flotation device of claim 21 , wherein the flotation device is configured to have a plurality of curves that extend across the top surface and bottom surface of the flotation device.