The present invention relates to an insole (1) comprising a lower layer (2), an upper layer (4) and an intermediate layer (3) arranged between the lower layer (2) and the upper layer (4). The lower layer (2) or base of the insole (1) is a supporting layer designed to be placed, in use conditions of the insole (1), above a sole of an item of footwear. The upper layer (4) is designed to be placed, in use conditions of the insole (1), in contact with a foot, with or without a sock, of a user. The intermediate layer (3) comprises natural feathers (5) distributed uniformly and treated so as not to allow displacement thereof along the intermediate layer (3). The invention further relates to an upper (1') of an item of footwear.
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