The disclosure relates to a smart footwear that is capable to maintain the temperature within the set range using Peltier modules (10.i), that are additionally used for energy harvesting. The footwear is equipped with plurality of inner temperature sensors (20.j). Outer temperature is recorded by one or more sensors (30.k). Data processing unit (70) executes a program for heating/cooling and energy harvesting, where only i-th Peltier module is used in time for heating/cooling and other modules (10.1) where i≠l for energy harvesting. In the preferred embodiment, the index i is changed consecutively to be 1->2->3-> . . . ->(N−1)->N with time period D that defines a duty cycle of each i-th Peltier module, and with the adjustable time period D1 before each new cycle 1->2->3-> . . . ->(N−1)->N, while all Peltier modules are in energy harvesting mode. Time periods D and D1 are used to regulate delivered power for heating/cooling.