Abstract: An insole includes an insole pad which has a toe section, a heel section and a shank section and which is constituted of top and bottom sheets heat sealed together. The top and bottom sheets confine therebetween a first air chamber in the toe section, a second air chamber in the heel section and an air passage in the shank section. The air passage is relatively narrower than the first and second air chambers. A compressible resilient member is disposed in the second air chamber so that, when the heel section is compressed and released, the second air chamber can act as an air pump to draw air into the first air chamber and force the air out of the first air chamber through vent holes formed in the toe section.