My Keen sandals just arrived in Big Kid size 6.  I am an adult female who normally wears a size 7 Wide width.  I did not like the idea of having to go to a larger size in this in order to get the width I need so I took a chance, measured my foot with the chart provided on the shoe site and ordered a big kid size 6.  They are a perfect fit in both length and width and are the most comfortable sandals I have ever owned.  They are bright and colorful and my husband thinks they look great.  I highly recommend this product.  They are going to Hawaii with me next month!