Last year my black reva flats went out of commission due to the elastic backing on one becoming stretched out. I recently purchased a replacement pair, the naiya comfort flats by Reneu. According to Nancy's Gone Green:
Launched in Spring 2012, Reneu is a line of fashion footwear made with lycra-covered memory foam insoles and consists of eco-friendly upper materials such as hemp, recycled polyester, eco-friendly ultrasuede, and other eco-friendly materials. Reneu shoes provide comfort for the feet and leave minimal impact on our planet. The shoes are 100% animal free and produced in a small production center in China according to fair labor standards.
Using this sizing method from about.com, I found my shoe size is a 7.5, average width. I can range anywhere from a 6.5-7.5. Since Reneu shoes are only offered in full sizes, I did some debating over what size to order. Eventually a 7 was decided upon, but I am finding I may have been safe with a size 8. With only a few hours of wear around the house and a dinner out (outfit above), my only concern is that the shoe might cause my feet to feel a bit scrunched over the course of a more intense work day. If you have narrow feet, you should have no problems. To combat the possibility of initial discomfort, I plan to continue wearing these on more sedentary days at first. From there I can gauge if these are ready to hold up to a typical day of teaching. If being a workhorse does not work out, they will get plenty of use with casual outfits.
Here are more Reneu options offered at Nancy's Gone Green. The zaria and bela have additional colors to view.