Tonneau cover Q

[Jim Rowan <jimrowan@uic.edu>]

This past weekend I fitted my new tonneau cover to the Sprite. Fits great
and looks smashing. One question though, what is the purpose of the 2 long
narrow flaps (1 on the drivers side 1 on passengers side)that are on top of
the cover about halfway back? The leading edge is sown to the cover and the
trailing end is not. The instructions mention nothing about them. 
Anybody?
TIA

Cheers,
Jim Rowan
60 Sprite