My summer boots (Keen Durand Waterproof Mid) are a size 9 and fit perfectly. I ordered these winter Durand boots in size 9 and they were far too small. I reordered a size 9 1/2. They're still significantly tighter than my summer size 9. They just don't have the roomy toe box that set Keen boots apart from other brands. I'm hoping they will be ok once the insulation compresses next winter. They seem to be well constructed. Time will tell.