A skin care composition comprising at least one native and isolated exopolysaccharide selected from Pol-3, Pol-5 and Pol-6 originating from a microorganism found in a kopara microbial mat, the EPS being in a concentration of about 0.001% w/w to about 1.5 % w/w of the composition, wherein said EPS is obtained by fermentation of the microorganism, wherein the microorganism is Alteromonas macleodii for Pol-3 and Pol-5 and Vibrio alginolyticus for Pol-6, and wherein: a) said Pol-3: i) has a molar ratio of about 6.8 galactose and 0.6 rhamnose for a glucose reference of 10.0, as determined by gas chromatography; ii) has a molar ratio of about 7 galacturonic acid for a glucuronic acid reference of 10.0, as determined by gas chromatography; iii) does not comprise xylose and fucose for a glucose reference of 10.0, as determined by gas chromatography; iv) has a ramified structure; and v) is capable of increasing hyaluronic acid production by senescent human fibroblasts; increasing the expression of filagrin, loricrin and involucrin genes; and increasing epidermis total lipid synthesis; b) said Pol-5: i) has a molar ratio of about 3.2 D-glucose, 2.9 D-galactose, 0.5 D-mannose, 2.0 D-glucuronic acid and 1.0 D-galacturonic acid, as determined by gas chromatography; ii) has a ramified structure; and iii) is capable of increasing epidermis total lipid synthesis; and decreasing bacterial adhesion of S. aureus and S. epidermis to the skin; and c) said Pol-6: i) has a molar ratio of about 0.7 rhamnose and 0.7 mannose for a glucose reference of 10.0, as determined by gas chromatography; ii) does not comprise galacturonic acid for a glucuronic acid reference of 10.0, as determined by gas chromatography; iii) does not comprise xylose, for a glucose reference of 10.0, as determined by gas chromatography; and iv) is capable of increasing epidermis total lipid synthesis; increasing the expression of filaggrin, loricrin, involucrin, transglutaminase, kallikrein 5, neurosin and stratum corneum chymotrypsic genes. a) said Pol-3: i) has a molar ratio of about 6.8 galactose and 0.6 rhamnose for a glucose reference of 10.0, as determined by gas chromatography; ii) has a molar ratio of about 7 galacturonic acid for a glucuronic acid reference of 10.0, as determined by gas chromatography; iii) does not comprise xylose and fucose for a glucose reference of 10.0, as determined by gas chromatography; iv) has a ramified structure; and v) is capable of increasing hyaluronic acid production by senescent human fibroblasts; increasing the expression of filagrin, loricrin and involucrin genes; and increasing epidermis total lipid synthesis; i) has a molar ratio of about 6.8 galactose and 0.6 rhamnose for a glucose reference of 10.0, as determined by gas chromatography; ii) has a molar ratio of about 7 galacturonic acid for a glucuronic acid reference of 10.0, as determined by gas chromatography; iii) does not comprise xylose and fucose for a glucose reference of 10.0, as determined by gas chromatography; iv) has a ramified structure; and v) is capable of increasing hyaluronic acid production by senescent human fibroblasts; increasing the expression of filagrin, loricrin and involucrin genes; and increasing epidermis total lipid synthesis; b) said Pol-5: i) has a molar ratio of about 3.2 D-glucose, 2.9 D-galactose, 0.5 D-mannose, 2.0 D-glucuronic acid and 1.0 D-galacturonic acid, as determined by gas chromatography; ii) has a ramified structure; and iii) is capable of increasing epidermis total lipid synthesis; and decreasing bacterial adhesion of S. aureus and S. epidermis to the skin; and i) has a molar ratio of about 3.2 D-glucose, 2.9 D-galactose, 0.5 D-mannose, 2.0 D-glucuronic acid and 1.0 D-galacturonic acid, as determined by gas chromatography; ii) has a ramified structure; and iii) is capable of increasing epidermis total lipid synthesis; and decreasing bacterial adhesion of S. aureus and S. epidermis to the skin; and c) said Pol-6: i) has a molar ratio of about 0.7 rhamnose and 0.7 mannose for a glucose reference of 10.0, as determined by gas chromatography; ii) does not comprise galacturonic acid for a glucuronic acid reference of 10.0, as determined by gas chromatography; iii) does not comprise xylose, for a glucose reference of 10.0, as determined by gas chromatography; and iv) is capable of increasing epidermis total lipid synthesis; increasing the expression of filaggrin, loricrin, involucrin, transglutaminase, kallikrein 5, neurosin and stratum corneum chymotrypsic genes. i) has a molar ratio of about 0.7 rhamnose and 0.7 mannose for a glucose reference of 10.0, as determined by gas chromatography; ii) does not comprise galacturonic acid for a glucuronic acid reference of 10.0, as determined by gas chromatography; iii) does not comprise xylose, for a glucose reference of 10.0, as determined by gas chromatography; and iv) is capable of increasing epidermis total lipid synthesis; increasing the expression of filaggrin, loricrin, involucrin, transglutaminase, kallikrein 5, neurosin and stratum corneum chymotrypsic genes.