Disclosed herein is a skin care composition comprising at least oneexopolysaccharide (EPS) originating from amicrobial mat, wherein the EPS is in a concentration of about 0.001 % w/w toabout 1.5 % w/w of the composition. Preferably,the EPS is derived from microorganism isolated from microbial mats found inFrench Polynesia. The composition is useful inreducing and preventing signs of skin aging and environmental damage byaltering skin cell metabolism and improving hydration.