So far my feet are warm. It's nice to not have to walk around in winter boots in the house! I am wearing them with socks and they work with cotton socks and with wool socks.

I normally wear a 7 or 7.5 and I got a size 7. It slips at the heel but not too much when I'm wearing the fairly thick wool sock. I would never consider wearing these out and about because the fit is definitely slipper-like. I actually have to work a little to get my heel in but then the ankle opening is loose once it's on.

I tried wearing them without socks and I could easily slip my foot in without using my hands (Yay!) but they were like flip-flops when walking. The length of the shoe is just right so it's not that I need a smaller size.

There is a seam at the back of the heel and on one of mine it is a little knobby so if the slipper fit tighter or I was wearing them without socks, that might be uncomfortable. With bulky socks it is not a problem.

The sole is completely flat; in other words the heel portion of the slipper is not any higher than the forward portion. Almost a slightly negative heel effect but it's OK.

Overall I am happy. I have tried a lot of different slippers and had started wearing shoes and socks and sometimes boots in the house in the effort to keep my feet warm. Previously, I had good results with&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/Crocs-Unisex-Mammoth-Clog/dp/B001A429O0/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Crocs Unisex Mammoth Clog</a>&nbsp;worn with thick wool socks for several years and then I guess the liner just got too smashed and they didn't work anymore.