Abstract: A garment or accessory includes an outer layer coupled to a liner that is partially removable via fasteners. The outer layer includes an inner surface and an outer surface. The liner includes an edge. A portion of the edge is coupled to the inner surface of the outer layer. The fastener includes a first member coupled to the inner surface of the outer layer and a second member coupled to the liner at an uncoupled portion of the edge of the liner. A space is formed between the liner and the inner surface of the outer layer. The space is accessible through the uncoupled portion.

Abstract: A heated apparel system comprises: a garment, a printed circuit board (PCB), a heating element, a first power source, and a second power source. The PCB is coupled to one or both of the first and second power sources and comprises a first resistor coupled to a first junction; a second resistor coupled to said first junction and a second junction; a negatively doped bipolar junction transistor (BJT), having a base terminal, an emitter terminal, and a collector terminal, said base terminal coupled to said first junction and said emitter terminal coupled to said second junction; an integrated circuit coupled to said collector terminal of said BJT and said second junction; and an n-channel metal-oxide-semiconductor field-effect transistor (MOSFET), having a source terminal and a drain terminal, with the source terminal coupled to the integrated circuit and the drain terminal coupled to the heating element.

Abstract: A garment or accessory includes an outer layer coupled to a liner that is partially removable via fasteners. The outer layer includes an inner surface and an outer surface. The liner includes an edge. A portion of the edge is coupled to the inner surface of the outer layer. The fastener includes a first member coupled to the inner surface of the outer layer and a second member coupled to the liner at an uncoupled portion of the edge of the liner. A space is formed between the liner and the inner surface of the outer layer. The space is accessible through the uncoupled portion.