I was on this site replacing my Husband's five finger Vibrams and noticed these boots. I had never worn Vibram shoes before. I literally get compliments on them all of the time from various ages from 16 to 70 on the unique and sleek look. They are super light weight and keep my feet warm in winter weather. Today, it is -1 degree and my feet are comfortable outside. I wear them with or without socks. My calves are wide but surprisingly the boots glide on with ease. I don't even undue the velcro on the calves, only the sole. I wear a size 9M women's and ordered the Medium boot, perfect fit. I work in an office setting and the boots look nice with my business casual clothes. The first few days I had to wear mole skin on my heels until my foot adjusted to the boot sole. I have no problem with the heel rubbing now. My clunky shearling boots got tossed to the side.