Insulated composite fabrics

An insulated composite fabric comprising:

• an inner fabric layer;
• an outer fabric layer;
• and
• an insulating-filler fabric layer enclosed between the inner fabric layer and the outer fabric layer,
• wherein the insulating-filler fabric layer is a textile fabric with a raised surface on at least one side of the fabric incorporating yarn comprising multicomponent fibers formed of at least a polypropylene and a polyethylene disposed in side-by-side relationship, the polypropylene and the polyethylene exhibiting differential thermal elongation or contraction to cause the multicomponent fibers to bend or curl and reversibly recover in response to changes in temperature, adjusting insulation performance of the insulated composite fabric in response to ambient conditions,
• wherein the yarn has a denier of about 150 to about 160, and
• wherein the multicomponent fibers exhibit an overall average displacement of about −5% to about −60% over a temperature range of from −22° F. (−30° C.) to 104° F. (40° C.).