An article and system for regulating temperature in footwear. Thermal footwear may include a power generation layer, a thermocell layer, and an accessory layer. The power generation layer may be constructed of an actuator materialfor example, a dielectric elastomerwhich may generate an electric current when compressed or decompressed. The thermocell layer may be configured to either warm or cool a user's foot, and may be reversible by being removably coupled to the power generation layer. The accessory layer may include other components; for example, an integrated circuit chip for power transmission to an external device may be included.

A shoe has a heated insole with a battery-receiving portion. A battery is insertable into and removable from the battery-receiving portion of the shoe's insole while the insole is disposed within the shoe.

A battery for use with a heated insole has a cushion portion on top of the battery to provide comfort when the battery is disposed within the insole.

A shoe has a heated insole with a battery-receiving portion. A battery is insertable into and removable from the battery-receiving portion of the shoe's insole while the insole is disposed within the shoe.

An assembly for inclusion in a heated insole has a heating member and a frame. The frame has a connector that allows a person to couple a battery to and decouple the battery from the heating member.