In this study lightweight 100% cotton fabric was successfully modified by the sol-gel method to impart high ultraviolet radiation (UVR) blocking property to the fabric surface. The cotton fabric was dipped in the nanosol solution for 1, 5 and 10 minutes, dried at 90ºC for 10 minutes with thermal post-treatment at 120ºC for 2 minutes. Comparison of coatings of samples prepared using different dipping time was made. The durability of the treatment was investigated by performing repeated home laundering. Excellent durability of the treatment was obtained, which indicates about good adhesion between the coating and the fabric surface. Before and after laundering tests ultraviolet protective properties of the textile samples were determined according to the standard, results of samples with dipping time 10 minutes show that textiles after treatment with nanosol have excellent ultraviolet protection properties, as well after laundering tests (50 washing-drying cycles) still provide excellent ultraviolet protection.