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A wide brim hat is vacuum formed from a thin sheet of specially formulated PVC plastic. The PVC effectively blocks transmission of both WVA and UVB radiation and thereby provides significant protection against the sun. A removable elastic headband centers a wearer's head within the hat and spaces th

A wide brim hat is vacuum formed from a thin sheet of specially formulated PVC plastic. The PVC effectively blocks transmission of both WVA and UVB radiation and thereby provides significant protection against the sun. A removable elastic headband centers a wearer's head within the hat and spaces the wearer's head from the crown of the hat. In this manner, cooling air passages are provided between the wearer's head and the interior of the hat crown.

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1. A hat formed of a sheet of vinyl plastic, and comprising: a crown; a brim surrounding said crown; and wherein said vinyl plastic comprises polyvinyl chloride (PVC) and said sheer has a thickness sufficient to block transmission of substantially all UV light, and wherein said hat blocks tran

1. A hat formed of a sheet of vinyl plastic, and comprising: a crown; a brim surrounding said crown; and wherein said vinyl plastic comprises polyvinyl chloride (PVC) and said sheer has a thickness sufficient to block transmission of substantially all UV light, and wherein said hat blocks transmission of substantially all ambient radiation having a wavelength from about 300 nm to about 850 nm. 2. The hat of claim 1, wherein said sheet comprises a UV inhibitor. 3. The hat of claim 1, wherein said sheet comprises a thickness of about 0.020 inch. 4. The hat of claim 1, wherein said crown and said brim are formed from said sheet by vacuum forming. 5. The hat of claim 1, wherein said crown and said brim are formed with a textured exterior surface. 6. The hat of claim 1, further comprising an anti-glare material provided on said brim. 7. The hat of claim 6, wherein said anti-glare material comprises a paint applied over an interior surface of said brim. 8. A hat formed of a plastic material, and comprising: a crown; a laterally extending brim surrounding said crown; a plurality of retainers mounted externally around said crown; and an elastic headband mounted within an interior portion of said crown and supported by said retainers. 9. The hat of claim 8, wherein said plastic comprises a sheet of PVC. 10. The hat of claim 8, wherein said crown comprises a side wall having a plurality of slots formed therein and wherein said plurality of retainers respectively overlie said plurality of slots. 11. The hat of claim 8, wherein said headband is spaced apart from said crown by said retainers. 12. The hat of claim 8, wherein said headband is removably mounted to said retainers. 13. The hat of claim 8, wherein said plurality of retainers is arranged in a rectangular pattern. 14. The hat of claim 8, further comprising a harband surrounding said crown and covering said retainers. 15. The hat of claim 8, further comprising a chin strap secured to said hat and a retainer post mounted on said brim for retaining said chin strap. 16. The hat of claim 15, wherein said retainer comprises a rivet. 17. The hat of claim 8, wherein said retainers are snap fit to said crown. 18. The hat of claim 8, further comprising an oval ridge and an oval groove each formed on a top portion of said hat. 19. The hat of claim 8, wherein said crown and said headband define an air cooling passage therebetween. 20. A hat formed of a sheet of vinyl plastic, and comprising: a crown; a brim surrounding said crown; and wherein said vinyl plastic consists solely of polyvinyl chloride and said sheet has a thickness sufficient to block transmission of substantially all UV light. 21. The hat of claim 20, wherein said sheet comprises a UV inhibitor. 22. The hat of claim 21, wherein said sheet comprises a thickness of about 0.020 inch. 23. A hat formed of a sheet of vinyl plastic, and comprising: a crown; and a brim surrounding said crown; wherein said vinyl plastic comprises polyvinyl chloride and said sheet has a thickness sufficient to block transmission for substantially all UV light; and wherein said crown and said brim are simultaneously formed from said sheet by vacuum forming. 24. The hat of claim 23, wherein said crown and said brim are formed with a textured exterior surface. 25. A hat formed of a sheet of vinyl plastic, and comprising: a crown; and a brim surrounding said crown; wherein said vinyl plastic comprises polyvinyl chloride and said sheet has a thickness sufficient to block transmission for substantially al UV light; and further comprising an anti-glare material provided on an interior surface of said brim. 26. The hat of claim 25, wherein said anti-glare material comprises a paint applied over said interior surface of said brim.