Not carbon fibre as stated in the product description. The entire frame is injection mold plastic with carbon fibre stickers along the sides of the templers and the bridge of the nose. If you look close at the pictures (which I should have done before buying) you can see the edges of the stickers. In the plus column, the glasses are very light-weight and comfortable. I do not see my reflection in the inside as stated in another review, but that person might.