Abstract: The present invention relates to a insole which is mainly made by the following process: reeling off single thread filament from recycled materials such as PET bottle, PET plastic material, waste fabric, recycled yarn into fiber; intermingling plastic fiber with the above fiber of recycled material and then conducting needle punching to form air-permeable thick layer of nonwoven fabric having 3-10 mm thickness; adhering nonwoven fabric or cover layer made by general fabric onto the air-permeable thick layer of non-woven fabric; conducting heat forming and cutting into suitable size. In this manner, not only the insole made by recycled material possesses environment protection feature but also the air-permeable thick layer of nonwoven fabric, which is needle punched from fiber, has excellent air permeability and appropriate elastic effect. Therefore, users have snug feeling achieved by good air permeability and shock absorption so that it has better performance in its total application.