Patent ID: 8585746

Claim:
An article of apparel for transferring heat to or from a body of an individual, the article of apparel covering a portion of a torso of the individual, and the article of apparel comprising: a front torso portion for covering a front area of the torso, the front torso portion including a front chamber element that defines a first interior void for containing a substance in either a liquid or a solid state, the front chamber element having a plurality of triangular subchambers; and a rear torso portion for covering a rear area of the torso, the rear torso portion including a rear chamber element that defines a second interior void for containing a substance in either a liquid or a solid state, the front chamber element having a plurality of triangular subchambers, wherein an average size of the triangular subchambers of the rear chamber element is greater than an average size of the triangular subchambers of the front chamber element, and wherein at least one of the front chamber element and the rear chamber element has a first surface in which a plurality of indentations are formed that define the triangular subchambers in the corresponding chamber element, portions of the indentations being unbonded to an opposite second surface of the corresponding chamber element, and each of the plurality of indentations forms a flexion line extending entirely across the corresponding chamber element.