Patent ID: 7977261

Claim:
A garment fabric for conservation of body heat of a wearer, the fabric comprising: an inner impermeable material layer of material for disposition, in use, adjacent the body of the wearer; an outer impermeable material layer of material substantially co-extensive with said inner layer and spaced therefrom; a spacer material disposed between and inwardly of edges of said inner and outer impermeable material layers, said spacer material, being of a selected one of a foam and a mesh and defining a mostly void volume; and a reflective layer of foil material disposed between said spacer material and a selected one of said inner impermeable material layer and said outer impermeable material layer; a second reflective layer of material disposed between said spacer material and the other of said inner impermeable material layer and said outer impermeable material layer; said inner and outer impermeable material layers including at least one layer comprising a cloth material coated with a fusible silicone; said inner and outer impermeable material layers being bound to each other by ultrasonic sealing and only along portions thereof outboard of said spacer material and said reflective layer of material to define a closed compartment solely containing said reflective layer of foil material, said second reflective layer and said spacer material, each of which being retained within said closed compartment by said inner and outer impermeable layers and each of which being in abutting, unfixed relationship and not otherwise bound to any of each other; the compartment being under a vacuum and the compartment having a valve for drawing the vacuum in the compartment; said spacer material having a thickness greater than a thickness of a combination of all layers comprising said inner and outer impermeable layers and reflective layer; said spacer material being disposed in the compartment and having a strength for resisting compression and for maintaining integrity of the compartment by separating the layers forming the compartment; whereby said reflective layer of material reflects body heat back toward a wearer of the garment and the second reflective layer of material and the vacuum substantially prevents heat transfer through the compartment.