Abstract: The present invention relates to apparel for use in a cold environment comprising: at least one pocket within the inner surface, where said at least one pocket includes a compartment for inserting a heating packet, where said compartment allows for adequate flow of oxygen to activate the heating packet. The compartment may include a mesh compartment. In one exemplary embodiment, the apparel for use in a cold environment may include: a plurality of pockets within the inner surface, where each pocket includes a mesh compartment, where said mesh compartment allows for adequate flow of oxygen to activate the heating packet; and at least one heating packet, where each heating packet is inserted in the mesh compartment of at least one of the pockets to provide thermal heat to the wearer. The apparel may include a glove, a mitten, a sweater, a jacket, a pair of pants, socks or shoes.