fibrillation gives an additional increase in upf a woven lyocell fabric made from fibers with incorporated inorganic nano scale pigments which was fibrillated after the weaving showed a nearly doubled upf compared to a similar fabric which was resin treated and defibrillated after weaving this is an important advantage especially in comparison to fibers with a uv protective finish where no fibrils of uv protective material occur another preferred embodiment is a fabric wherein the high tenacity man made cellulosic fibers are modal fibers i e fibers manufactured according to a modified viscose process for example described in the austrian patent publication at 287905 these fibers also show a remarkably high tenacity in the conditioned as well as in the wet state despite their performance in some aspects is lower than that of a lyocell uv protective fiber fibers manufactured according to a standard viscose process with incorporation of uv protective particles will never reach the required mechanical properties especially not in the wet state according to the field of the invention the high tenacity man made cellulosic fibers in this fabric show a fineness of 0 8 to 3 3 dtex preferably 0 9 to 1 7 dtex fibers with a higher fineness will not show sufficient mechanical properties due to the influence of the uv protective particles fibers with a lower fineness i e larger diameter will not be suitable for the soft light weight fabrics mostly the fabrics are knitted or woven fabrics such fabrics preferably have a.