Breathable sole structure

A breathable sole structure having a lower face (2) which in practice forms the tread of an item of footwear to which the sole is applied, and an upper face (3) which is practice can face the inside of the item of footwear to which the sole is applied, the breathable sole structure (1) having at least one ventilation duct (4) extending from an inlet section (5) made in the upper face (3) to an outlet section (6) made in the lower face (2), the sole structure being characterised in that the duct comprises at least one main stretch (7) extending in a plane substantially parallel with a longitudinal direction of extension of the breathable sole structure (1) and having a first end (8) and a second end (9) in fluid communication with the duct outlet section (6), and also being characterised in that it also comprises at least one dome-shaped portion (10), made of an elastically deformable material and extending in a raised fashion from the upper face (3), said dome-shaped portion (10) forming inside it a chamber (11) in fluid communication with the first end (8) of the main stretch (7) of the duct and having an opening which puts in communication the chamber (11) and the outside of the upper face (3) and which forms the ventilation duct (4) inlet section (5).