I buy these for my son 's birthday , and unfortunately , the size do not work as he usually wear a 11-1\/2 and a 12 be too big and the 11 too small . the sandal have a back strap , which we think would be great to get the perfect fit , but they just do not and have to return . unfortunately , the fullfillment company charge a restock fee . Amazon be kind enough to give I a credit on my account since it be not clear in the description that return would be penalize . we re-order the Ecco sandal from Amazon , and all be well . we realize sandal only come in full size , but the Clark just do not cut it .