I special ordered these boots as my calfs are 17 1/4 round and they boasted a 19 opening. I wear these boots almost daily but they are a bit tight and get sweaty when I walk for too long in them. For the cost I was a little disappointed that the shaft seems to only be wide at the very top and not all the way down. However the boots are incredibly comfortable and well constructed...maybe Hunter will read the feedback from all us large calves Ladies and redesign! (I would have several pairs of these if they fit better)