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Articles of apparel comprising insulating components having insulating structures with low thermal conductivity. Preferred insulating components for use in apparel have an insulating structure comprising a gas impermeable envelope and a porous material contained within the envelope where the insulat

Articles of apparel comprising insulating components having insulating structures with low thermal conductivity. Preferred insulating components for use in apparel have an insulating structure comprising a gas impermeable envelope and a porous material contained within the envelope where the insulating structure has a thermal conductivity of less than or equal to 25 mW/m K.

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I claim: 1. A method of insulating a boot comprising providing a boot having a toe cap area, a boot upper and a boot sole; providing a mixture comprising a porous material selected from fumed metal oxide and aerogel; compressing the mixture to form a structure material, placing more than one sectio

I claim: 1. A method of insulating a boot comprising providing a boot having a toe cap area, a boot upper and a boot sole; providing a mixture comprising a porous material selected from fumed metal oxide and aerogel; compressing the mixture to form a structure material, placing more than one section of the structure material in a gas impermeable envelope, evacuating air from the envelope at reduced pressure, and sealing the envelope, to form a flat insulating structure comprising more than one section of structure material within the envelope; sealing the envelope between sections of the structure material within the envelope to provide flexibility to the flat insulating structure for shaping; shaping the flat insulating structure from a flat structure into the form of a shaped insulating structure; and inserting the shaped insulating structure into the boot, the shaped insulating structure having a thermal conductivity of less than or equal to 25 mW/m K at 25° C. 2. The method of claim 1, wherein the boot comprises inner and outer boot layers and the shaped insulating structure is positioned between the layers. 3. The method of claim 1, wherein the shaped insulating structure is affixed to an inner boot layer and adjacent a wearer of the boot. 4. The method of claim 1, wherein the flat insulating structure is shaped into the form of a curved shaped insulating structure that corresponds to the toe cap area of the boot. 5. The method of claim 1, wherein the gas impermeable envelope is under a vacuum pressure of up to about 10,000 Pa. 6. The method of claim 1, wherein the gas impermeable envelope is under a vacuum pressure of about 1,000 Pa or less. 7. The method of claim 1, wherein the method comprises forming the flat insulating structure having a thickness of less than 3 mm. 8. The method of claim 1, wherein the method comprises forming the flat insulating structure having a thickness of 2 mm or less. 9. A method of insulating a boot comprising providing a boot having a toe cap area, a boot upper and a boot sole; providing a mixture comprising a porous material selected from fumed metal oxide and aerogel; compressing the mixture to form a structure material, placing more than one section of the structure material in a gas impermeable envelope, evacuating and sealing the envelope at reduced pressure, to form a flat insulating structure comprising more than one section of structure material within the envelope; sealing the envelope between sections of the structure material within the envelope to provide flexibility to the flat insulating structure for shaping; shaping the flat insulating structure from a flat insulating structure into a form of a shaped insulating structure; and inserting the shaped insulating structure into the toe cap area of the boot, the shaped insulating structure having a thermal conductivity of less than or equal to 25 mW/m K at 25° C. 10. The method of claim 9, wherein the flat insulating structure has a loss of thickness of 20% or less at a pressure of 1 atmosphere. 11. The method of claim 9, wherein the flat insulating structure has a loss of thickness of 10% or less at a pressure of 1 atmosphere. 12. The method of claim 9, wherein the porous material is a fumed metal oxide. 13. The method of claim 9, wherein the porous material is fumed silica. 14. The method of claim 9, wherein the porous material is fumed alumina. 15. The method of claim 9, wherein the flat insulating structure is shaped into the form of a curved shaped insulating structure that corresponds to the toe cap area of the boot. 16. The method of claim 9, wherein the gas impermeable envelope is under a vacuum pressure of up to about 10,000 Pa. 17. The method of claim 9, wherein the gas impermeable envelope is under a vacuum pressure of about 1,000 Pa or less. 18. The method of claim 9, wherein the boot comprises inner and outer boot layers, and the method further comprises positioning the insulating component between the inner and outer boot layers. 19. The method of claim 9, wherein boot comprises an inner boot layer, and the method further comprises affixing the insulating component to the inner boot layer adjacent a wearer of the boot. 20. The method of claim 9, wherein the method comprises forming the flat insulating structure having a thickness of less than 3 mm. 21. The method of claim 9, wherein the method comprises forming the flat insulating structure having a thickness of 2 mm or less.