At size 10 these were way too wide in the heel.  The toe was wide and boxy, but there was too much height and the laces made the shoe pucker at the bottom lace at the toe.  9.5 has been my size, except in crocs which are 10.  I ordered the 9.5 but it was too short so my toe was hitting on the top of the shoe when I walked around the living room.  It claims to be a medium, but the box says 10d (u.s.)  I only tried one shoe from each size, so they are going back.  I search and search for the boxy toe, but have not found many.  I have one in an old 11 year pair of Asics.  When I tried to get more of the same, no go so far.  There are styles I have yet to try on in Asics.  They may sell this Altra in narrower sizes in other countries, the reason the box says &#34;d&#34;.  I wanted the pink pair, so undepressing, and less money.  Could have worked for tennis, biking, hiking but too wide in most of the shoe.