To provide double socks which each wholly comprises a double fabric, has a high heat-insulating property, prevents the direct contact of a leg main body with the knitted fabric back side on which inner surface piles and the like are disposed, facilitates to give energy to the leg during an exercise, is obtained by automatically inserting the outer cylinder portion into the inner cylinder portion to save labors, and can increase the elasticity of the rib top portion, and to provide a method for producing the same.

The double socks each is produced by forming the inner cylinder portion and the outer cylinder portion from a cylindrical knitted fabric which has a connected portion at the rib top portion, and then integrally sewing both the ends of the doubled cylindrical knitted fabric at the toe portion. Therein, the characteristics comprise using a circular sock-knitting machine equipped with a cylinder 10 and a dial 11, holding a knitting yarn 17 on the desired jack 15 of the dial 11, fixing one end of the inner cylindrical portion 2 of the cylindrical knitted fabric A, starting a knitting operation from the toe portion 4a of the inner cylinder portion 2, sequentially superposing the inner cylindrical portion 2 and the knitted portion by a suction force, and finally knitting the toe portion of the outer cylindrical portion.