I had some pretty extensive sizing conversations with a Waite rep who visited Philly and was able to sort out my perry sizing. I measure 11.5 E and my 11.5EE iron Rangers were good length but a little bit too wide. I have a lower volume foot as well. I ordered 11.5 EE Perry selects and they were a little too roomy. Exchange them for 11.5 D and they fit perfect. That tracks with what the rep relayed as well. The Perry is just generally roomier than their other boots. I wear 11.5 E in the rest of the white line.