For the record, they are incredibly warm and cozy and I love wearing them around campus with my moccasins on cold days. I haven't tried it yet, but I am also thinking that they would be awesome with rain boots. Around the house, I'll layer them over some yoga pants for extra warmth if I'm feeling a bit chilly.
A bit about the fit:
When not stretched out,
the warmers extend over my knee. You can see in the picture that I used a stirrup design, but you can easily scrunch up the heel and not wear them over the foot if you so choose. The ribbing on the top cuff and foot is both 1x1. If I decide to make another pair, I think that I'll make the next ones 3 to 5 inches shorter to make them more feasible to wear with rain boots. Right now, the scrunching action might be a little too bulky for that.