I usually wear a borderline wide, so I ordered the same boots in both medium & wide so I could compare and decide.  I had my doubts with the medium because it's pretty snug going on but I walked around with them on inside the apartment for an hour and now they fit like a glove; very soft and comfortable leather.  When I tried on the wide, the toe box area is a little on the too wide side but still ok however the middle through to the heel and on up the ankle are very wide and sloshed around considerably on my foot.  That one's going back.  So if your heel narrows like mine does, go with the Medium (B) width.  This is a great, short boot for pants and jeans, with comfy padding on the inside sole and a just right and STABLE heel.