Was elated when I found these online in size small, everywhere else I checked only had mediums. Managed to snag the last pair. They fit perfectly over tights/leggings, though I haven't tried them over pants. I have thick calves, so over pants, a med might be better. However at that point I'd probably wear snow pants. Overall, very impressed by the quality and they look and feel like they'll last me a lifetime (fingers crossed). Stoked to put these bad boys to work.