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,

and wherein the extruded foam is a flexible cellular foam,

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.

2. A method of manufacturing a flotation device comprising:

extruding a flexible cellular polyethylene foam through a die, wherein the shape of the die corresponds to the lateral shape of the flotation device when taken perpendicularly to a longitudinal dimension of the flotation device and defines a lateral curvature when viewed in cross section that extends across a top surface and a bottom surface of the flotation device, and

feeding the extruded flexible cellular polyethylene foam through a rotary die cutter to thereby create the flotation device comprising:

the top surface,

the bottom surface,

a first side rail,

a second side rail,

a leading lateral surface, and

a trailing lateral surface,

wherein the lateral curvature that extends across the top surface is shaped so as to be reciprocal of at least part of the lateral curvature that extends across the bottom surface,

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, and

wherein the plurality of curves includes at least a central curve.

3. The method of manufacturing a flotation device according to claim 2 wherein the plurality of curves are further formed to define at least two perimeter curves, and

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.

4. The method of manufacturing a flotation device according to claim 2 , wherein the rotary die cutter cuts the flexible cellular polyethylene foam to define the lateral trailing surface of one flotation device and the lateral leading surface of an ensuing flotation device at the same time.

5. The method of manufacturing a flotation device according to claim 2 , wherein the rotary die cutter is configured to cut the extruded flexible cellular polyethylene foam at a time interval so as to create a flotation device having a greater longitudinal dimension compared to the lateral dimension of the flotation device.

6. The method of manufacturing a flotation device according to claim 2 , wherein extruding the flexible cellular polyethylene foam further comprises extruding the flexible cellular polyethylene foam through a die so as to form a plurality of skins on each of the top surface, bottom surface, a first side rail surface and a second side rail surface of the flotation device.

7. The method of manufacturing a flotation device according to claim 5 , wherein the rotary die cutter is configured to cut through the plurality of skins on each of the top surface, the bottom surface, and each of the side rail surfaces so as to create a leading lateral surface and a trailing lateral surface without a corresponding leading lateral skin or a trailing lateral skin.

8. The method of manufacturing a flotation device according to claim 2 , wherein extruding the flexible cellular polyethylene foam through a die further comprises extruding the flexible cellular polyethylene foam through a die shaped to provide a curvature to the extruded flexible cellular polyethylene foam.

9. The method of manufacturing a flotation device according to claim 7 , wherein the flotation device includes a longitudinal stiffness that is greater than a lateral stiffness of the flotation device.