I bought these for my son's birthday, and unfortunately, the sizing didn't work as he usually wears an 11-1/2 and a 12 was too big and the 11 too small. The sandal has a back strap, which we thought would be great to get the perfect fit, but they just didn't and had to return. Unfortunately, the fullfillment company charges a restocking fee. Amazon was kind enough to give me a credit on my account since it wasn't clear in the description that returns would be penalized. We re-ordered the Ecco sandal from Amazon, and all was well. We realize sandals only come in full sizes, but the Clark just didn't cut it.