Hookless RBH40BBS01 Polyester Snap-in Shower Curtain Liner and Flex-On Rings, Bright White

Does the fabric liner keep water from leaking thru like the plastic liners when keeping the liner in the tub during showering?

I have 2 sets of these at home, my question is do this mildew and mold up after a few months? both of mine have, its ridiculous for the price to mold.

Are the fabric and plastic liners interchangeable for the curtains with a window and snap in liner option?

when they say 70 x 54 size, is the 54 the length of the liner?