Shoes have insoles primarily to make them more comfortable to wear They help to support your feet and relieve pain or pressure by being placed inside the shoe. Most shoes, such as sneakers or boots, have glued-in insoles in the footbeds, while some shoes have removable ones, which allows you to add your own insoles for added comfort and mobility 。 Additionally, insoles have been shown to help with pain and inflammation in the knees, hips, and lower back by realigning the placement of the feet
It's important to note that there is another type of insole called orthotics, which are prescription medical devices worn inside shoes to correct biomechanical foot issues such as problems with how you walk, stand, or run.
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a good insole also : Sweat absorption
shock absorption
decompression