The Aerosole Lasticity boot is an excellent value for comfort and style. The material does not look or feel cheap in construction. The heel is rubber with a nice give that makes for a comfortable stride, even after walking all day. I have walked all over NYC in these and lived to tell the tale. The heel is not very high--if you really like heels then it might feel too short, but I find it best for long walks. The calf portion is fitted and zips up to just below my knee. It has three darts at the top that give a little room for larger calfs. If your calf is rounder, when you first put it on, it may feel tight, but as you wear them, the darts will stretch and become more comfortable.  For me, the calf has enough give that I can zip leggings inside them.

Note, I have purchased the black pair 3 times and the brown once. I wore them almost every day including through snow and rain. During this high use period, the rubber in the boot heel wore off after about a year. When note wearing everyday, or when note walking all over the city, they last a lot longer.