Have a pair of old Keens so I ordered the same size. I've never owned a more comfortable air of shoesthat i could wear fir years and wash the way I have washed my Keens!  Too bad thesewere unbearably small and I had to ship them back. Was it the furry lining that made them feel smaller?? Seemed comfy- and because I loved my old pair so much,  I'll reorder them a half size larger in this style. However, as for ordering any other (non fur lined) Keens online, I'll  try on a par of regular shoes IN a store so I can order accurately from Amazon next time.  With three kids and two dogs, always going in and out of the house,I can't live without a pair of comfy slip ons! :)