Safety helmet

A safety helmet comprising:

• an outer shell configured for surrounding a head of a user, the outer shell comprising a rigid thermoplastic material that is permeable to infrared radiation from an exterior of the helmet;
• an infrared reflective layer, comprising aluminum, gold, silver, or copper having a purity of at least 95%, on substantially the entirety of an inner surface of the outer shell, the infrared reflective layer being configured for reflecting at a least a portion of incident infrared radiation transmitted through the outer shell;
• and
• an evaporative cooling pad positioned within a cavity defined by the inner surface of the outer shell, the evaporative cooling pad comprising:
• a top waterproof, vapor permeable layer and a bottom waterproof, vapor permeable layer with a cavity defined therebetween, wherein the outside surface of the bottom layer is configured to be in contact with the head of the user;
• wings having a shape and size configured to extend to a temple of the user, and
• a liquid absorbing layer positioned within the cavity,
• wherein the at least 95% pure infrared reflective layer has infrared reflectivity of at least 83%, a hemispherical emissivity of less than 0.2 to prevent the at least a portion of incident infrared radiation from permeating the reflective layer to the interior of the helmet, and a thickness of the infrared reflective layer is 20 nm to 5 μm.

A method of manufacturing a safety helmet comprising:

• molding an outer shell of the safety helmet out of a rigid thermoplastic material that is permeable to infrared radiation from an exterior of the helmet;
• and
• applying an at least 95% pure infrared reflective layer onto at least a portion of an inner surface of the outer shell by depositing a metallization layer directly on an inner surface of the outer shell,
• wherein the at least 95% pure infrared reflective layer has infrared reflectivity of at least 83%, a hemispherical emissivity of less than 0.2 to prevent the at least a portion of incident infrared radiation from permeating the reflective layer to the interior of the helmet, and a thickness of the infrared reflective layer is 20 nm to 5 μm.

A safety helmet comprising:

• an outer shell configured for surrounding a head of a user, the outer shell comprising a rigid thermoplastic material that is permeable to infrared radiation from an exterior of the helmet;
• and
• an infrared reflective layer, comprising aluminum, gold, silver or copper having a purity of at least 95%, disposed on substantially the entirety of an interior of the outer shell, the infrared reflective layer comprising a metallization layer which is directly deposited to an inner surface of the outer shell and is configured for reflecting at a least a portion of incident infrared radiation transmitted through the outer shell;
• and
• wherein the at least 95% pure infrared reflective layer has infrared reflectivity of at least 83%, a hemispherical emissivity of less than 0.2 to prevent the at least a portion of incident infrared radiation from permeating the reflective layer to the interior of the helmet, and an optical density of at least 2.0.