the difference in weight between a good quality mens frame
and a step through frame of identical construction
for instance
the difference between mens and ladies frames of the same make and model
is usually not enough to give a second thought

there seem to be fewer and fewer good quality step through frames
as the years go on
though
and the above statement about weight does not necessarily apply
to comfort bikes and city bikes

but i have seen some very nice light step through frames in my life
from manufacturers like fuji and univega