To solve the problems of salaried workers and people wearing shoes all day long in an area of high temperature and high humidity, who find it difficult to keep a comfortable environment inside the shoes because of sweating, odor, of the like of the feet if insole products sold in the market are used, and who as a result frequently suffer from a trouble of the feet such as odors, athlete's foot, or the like.

A plurality of fine narrow tubes from the heel part to the toe of an insole are arranged in parallel on the entire or a part of the surface, with a plurality of air exhaust ports installed in positions between the toes of the feet.