I wear an 8M and bought both the Beach and Niles in MED. They both fit, but the Niles are significantly smaller. Neither my toes, nor the sides of my foot touch anywhere in the Beach, but do touch the end and sides of the Nile. I love them both and alternate wearing them and my Teva sandals and flip flops to walk my dog everyday. We usually walk 1-4 miles/day and the Crocs have been like walking on marshmallows so far. I plan on taking both my Crocs and Tevas to WDW next month, just so I can trade them out.