Time trial bicycle helmet with ear shield

1. A helmet, comprising:

an aerodynamic helmet body comprising a front portion, an opposite a tail portion, and an opening configured to receive a wearer's head, the tail portion comprising two side portions each having a lower edge curving downward behind an ear of a wearer when the helmet body is worn by the wearer; and

a shield comprising two ear shield portions connected to each other adjacent the front portion of the helmet body by a brow portion;

wherein the shield is releasably coupled to the helmet body through magnetic coupling when the shield is connected to the helmet body, the magnetic coupling occurring between at least one shield magnet coupled to the shield and aligned with at least one body magnet in the helmet body; and

wherein the helmet body is configured to leave a majority of the ear of the wearer exposed with respect to the helmet body, and the ear shield portions extend rearward from the brow portion of the shield aligned with the front portion of the helmet body to respective front edges of the two side portions of the tail portion and align aerodynamically with the two side portions of the tail portion and cover at least a portion of the ears of the wearer when connected to the helmet body adjacent to the front portion.

2. The helmet of claim 1 , wherein an outer surface of the brow portion of the shield is recessed with respect to an outer surface of the front portion of the helmet body such that at least part of the helmet body overhangs the brow portion of the shield; and wherein the two ear portions of the shield are in direct contact with the two side portions of the tail portion of the helmet body.

3. The helmet of claim 1 , wherein the at least one body magnet is encased within the helmet body.

4. The helmet of claim 1 , further comprising a shield vent at a top edge of the brow portion of the shield that is separated from a corresponding portion of the front portion of the helmet body to leave an opening between the brow portion of the shield and the front portion of the helmet body when the shield is connected to the helmet body;

wherein the helmet body comprises at least one interior channel to direct air passing through the at least one brow vent into the helmet.

5. The helmet of claim 1 , wherein the front portion of the helmet body comprising a maximum thickness in a range of 40-50 mm, the tail portion of the helmet body comprising a maximum thickness greater than the maximum thickness of the front portion.

6. The helmet of claim 1 , wherein each ear portion of the shield comprises at least one ear vent extending through the ear portion of the shield.

7. The helmet of claim 1 , wherein the brow portion of the shield comprises an eye shield that extends downward from the brow portion and is configured to cover at least the eyes of the helmet wearer.

8. A helmet, comprising:

an aerodynamic helmet body comprising a front portion, an opposite a tail portion, and an opening configured to receive a wearer's head, the tail portion having a lower edge curving downward and forming two side portions that leave a majority of ears of a wearer of the helmet body exposed with respect to the helmet body when the helmet body is worn by the wearer; and

a shield comprising two ear portions connected by a brow portion adjacent the front portion of the helmet body;

wherein the shield is magnetically coupled to the helmet body through magnetic coupling when the shield is connected to the helmet body, the magnetic coupling occurring between at least one shield magnet coupled to the shield and aligned with at least one body magnet recessed into at least one of the two side portions of the helmet body;

wherein the helmet body is configured to avoid covering ears of a wearer of the helmet body when the helmet body is worn to leave a majority of the ear of the wearer exposed with respect to the helmet body, and the two ear portions of the shield are configured to extend rearward from the brow portion of the shield, aligned with the front portion of the helmet body, across and covering a majority of the ears of the wearer when the shield is worn, and to contact the two side portions of the tail portion to aerodynamically align with the two side portions of the tail portion when the shield is worn; and

wherein the tail portion is tapered and the front portion has a rounded leading edge, such that the helmet body has a tear drop form factor.

9. The helmet of claim 8 , wherein an outer surface of the brow portion of the shield is recessed with respect to an outer surface of the front portion of the helmet body such that at least part of the helmet body overhangs the brow portion of the shield, and wherein both outer surfaces of the two ear portions of the shield are substantially flush with an outer surface of the two side portions of the tail portion of the helmet body.

10. The helmet of claim 8 , further comprising at least one indentation set in a lip of the helmet body, the at least one body magnet encased within the helmet body near the at least one indentation, and the at least one shield magnet coupled to the shield and sized to fit within the at least one indentation.

11. The helmet of claim 8 , further comprising a shield vent at a top edge of the brow portion of the shield that is separated from a corresponding portion of the front portion of the helmet body to leave an opening between the brow portion of the shield and the front portion of the helmet body when the shield is connected to the helmet body;

wherein the helmet body comprises at least one interior channel to direct air passing through the at least one brow vent into the helmet.

12. The helmet of claim 8 , wherein the front portion of the helmet body comprising a maximum thickness in a range of 40-50 mm, the tail portion of the helmet body comprising a maximum thickness greater than the maximum thickness of the front portion.

13. The helmet of claim 8 , wherein each ear portion of the shield comprises at least one ear vent extending through the ear portion of the shield.

14. The helmet of claim 8 , wherein the brow portion of the shield comprises an eye shield that extends downward from the brow portion and is configured to cover at least the eyes of the helmet wearer.

15. A helmet, comprising: a helmet body comprising a front portion, an opposite tail portion, an opening configured to receive a wearer's head, and a plurality of body magnets, the tail portion having a lower edge curving downward behind ears of a wearer of the helmet when the helmet is worn and the tail portion comprising at least one of the plurality of magnets on the tail portion behind a majority of the ears of the wearer when the helmet is worn; and

a shield comprising a plurality of shield magnets and two ear portions connected by a brow portion adjacent the front portion, each of the two ear portions comprising at least one of the plurality of magnets;

wherein the shield is releasably coupled to the helmet body by magnetic attraction between the plurality of body magnets and the plurality of shield magnets, the plurality of body magnets aligned with the plurality of shield magnets when the shield is coupled to the helmet body; and

wherein the helmet body is configured to avoid covering ears of a wearer of the helmet body when the helmet body is worn to leave a majority of the ears exposed with respect to the helmet body, and the two ear portions of the shield are configured to extend rearward from the brow portion aligned with the front portion of the helmet body to the tail portion, covering a majority of the ears of the wearer, and align with the tail portion behind a portion of the ears of the wearer when the shield is worn.

16. The helmet of claim 15 , wherein an outer surface of the shield is recessed with respect to an outer surface of the front portion of the helmet body, and wherein the outer surface of the shield is substantially flush with an outer surface of the tail portion of the helmet body.

17. The helmet of claim 15 , further comprising a shield vent at a top edge of the brow portion of the shield that is separated from a corresponding portion of the front portion of the helmet body to leave an opening between the brow portion of the shield and the front portion of the helmet body when the shield is connected to the helmet body;

wherein the helmet body comprises at least one interior channel to direct air passing through the at least one brow vent into the helmet.

18. The helmet of claim 15 wherein the front portion of the helmet body comprising a maximum thickness in a range of 40-50 mm, the tail portion of the helmet body comprising a maximum thickness greater than the maximum thickness of the front portion.

19. The helmet of claim 15 , wherein each ear portion of the shield comprises at least one ear vent extending through the ear portion of the shield.

20. The helmet of claim 15 , wherein the brow portion of the shield comprises an eye shield that extends downward from the brow portion and is configured to cover at least the eyes of the helmet wearer.