A top-mounted sun protection system has a box element (12; 112) for attachment to a window frame, which has a cavity (16; 116) for receiving the sun protection device (100), with a massive layer (20, 26; 26a; 26b; 32; 126) is provided, the density of which is high compared to thermal insulation materials. In order to increase the sound insulation effect on the inside of the building without impairing the thermal insulation properties, it is provided that at least three layers are arranged in succession between the cavity (16; 116) and the inside of the room, of which at least two layers (20; 26; 26a; 26b; 32 ; 126) as massive layers with a weight per unit area of more than 1 kg / m 2 and at least one layer (24; 24a, b, c, d; 28; 124; 128; 124; 134 ) is provided from thermal insulation material with a dynamic rigidity which corresponds to the dynamic rigidity of the material of the box element (12; 112) or is less than this.
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