Very comfortable.  I am normally a 6 1/2 and I ordered that size and had sufficient room to accommodate thicker socks During the winter I wear this or the other pair Ariat's black boots that I own.  The support is wonderful.  I just recently bought a pair of boots that were made by a well know manufacturer but the fit was awful and had little to no support.  Needless, to say I am now sticking to Ariat as their quality, sizing and comfort are right on.