<p>The invention relates to an antifouling film for protecting parts that are in contact with sea water, wherein the film (1) made of thermoplastic synthetic material has a breaking elongation in the range of 100 to 200%, a 2% modulus in the range of 15 to 25 N/15mm and a tensile force in the range of 25 to 40 N/15mm. The film comprises a ridge structure that is formed by ridges, wherein a ridge has a width (b) of 1 to 15 µm and a height (h) of 30 to 60 µm. The distance (a) of adjoining ridges ranges from 40 to 80 µm and the opening angle (w) of the ridge flanks ranges from 30 to 45°.</p>
