I also have narrow feet. I ordered the boot size recommended for my shoe size and they worked perfect. They are heavy rubber slip on, no liners, so you want to bring heavy socks, (or 2 pair of regular socks which I did). Believe me; you want their good heavy (totally waterproof) rubber boots on when getting in and out of the rafts on the wet landings. Keep in mind you will be walking through Penguin doo doo, so your boots get hosed off each time you return to the ship, another reason to have on the good rubber boots. No one on our tour appeared to have any problem with the boots. The gear provided by OAT, worked perfect. The Parka's run a bit large. I normally would wear a medium (size 8 - 10), the size small gave me plenty of room, and boy do they keep you toasty warm. Another recommendation I have for keeping your hands nice and dry is to wear a pair of regular kitchen rubber gloves under your other gloves. They kept my hands nice and dry on both our Antarctic and Patagonia Trips. I believe I was the only one that ended up with totally dry hands when we got back on the ship. We did this trip December 2011. The best Christmas we ever spent was crossing Drake Passage in one of the worse crossing made in 3 years (what fun and excitement). Hope you enjoy this trip as much as we did. Wait until you see the cabins, so awesome for an expedition ship, then there's the food and crew. You are in for a trip of a lifetime.