These are great boots - do everything advertised for them. I too have flat feet and week ankles, and they fit like a glove EXCEPT they are just a hair shorter than the other footware in my closet. I wear a size 9 in everything else...shoes, hiking, and cowboy boots...but I am a litle close to the cusp of a 9.5, and my toes have just a little tighter contact with the front of the toe box than I would like. So today, I am ordering my second pair of these, and this time, I'll order them in a 9.5.Again, they are a great and comfortable boot, but if your normally worn size is at all tight on your toes, think about getting the next size up. You won't regret it.