An insole which generates an air flow during use, which assists in cooling or warming the foot of a user is disclosed. In a first embodiment, air flow facilitated by said insole provides for convective heat transfer away from the plantar surface of the foot. The insole is intended for insertion into a shoe which is ventilated, preferably an athletic shoe with a ventilated upper. The bottom layer defines a plurality of ridges and a channel lining portion which together define a plurality of air channels. The bottom layer defines a heel recess in which a heel pad is situated. In a second embodiment, an insole which collects, retains, and heats and to a user's foot is disclosed. Said insole further comprises a middle layer of thermal reflective material secured to and coextensive with a top layer and a bottom layer secured to said middle layer.