Leaky chest wader questions

Hi,

I've got some chest waders, the cheap kind from Walmart, that have begun to
leak. They appear to be leaking around where the boot part is attached to the
upper part, because it's wet in that area above and of course below that point,
all the way around on the right side and in spots on the left. Is the water
coming in at the joint and then wicking up the leg as well as going down into
the boot? If that's what's going on, how to fix it? If that's not what's going
on, what is and how to fix that?

Thanks for any help!
David