38 has been trimmed to fit within the vertical dimensions of the window frame the ridges labelled 42 and 62 are horizontal support ridges for use with horizontal windows such as vehicular 34 hatch back 34 windows the ridges labelled 41 and 61 are vertical support ridges for use with vertical windows such as ordinary residential windows having a lower and upper margin the upper vertical support ridge 61 would ordinarily not bear any load fig1 and 12 are a side view and a perspective view respectively of a fig8 panel 38 installed on a 34 hatch back 34 vehicle the flaps 18 are shown in a downward horizontal position that blocks direct sunlight but still allows the occupants to see out the horizontal support ridges 42 62 are rested on the 34 o 34 ring gasket 32 before the 34 hatch back 34 window 55 is closed so that the panel 38 is locked between the gasket 32 and the 34 hatch back 34 window 55 as shown in fig1 and 12 the strengthening ribs 29 help support the panel stiffly span the open area 44 with the upper and lower support ridges 42 62 resting on the 34 o 34 ring gasket 32 as suggested by fig9 additional panels 38 can be positioned on either.