Sunshade assembly and respective flexible sunscreen

A flexible sunscreen (4) is provided intended for use in a sunshade assembly of the type comprising a flexible sunscreen (4) having a central part (4') and two opposed inwardly folded longitudinal edges (4") connected to the central part by means of folding lines (13), and two opposed longitudinal guides (6,7) for receiving therein and guiding corresponding ones of the inwardly folded longitudinal edges (4") of the flexible sunscreen (4), which guides are provided with locking members (14) for engaging an outer end (17) of the inwardly folded longitudinal edges for preventing these edges from moving out of the longitudinal guides. The central part (4') of the flexible sunscreen (4) mainly is manufactured from a first material with a first stiffness wherein of the inwardly folded longitudinal edges (4") and of the parts of the central part (4') adjacent the edges (4") at least part is made of a second material with a second higher stiffness.