Couldn't find a 10 and 1/2.  This works.  The neoprene padding makes the shoe instantly comfy.  The shock pad and arch support noticably improve the sandals.  The older style triangular strap guides worked better in my opinion.  The new rectangular strap guides are a little tight,  making the removal and donning of the shoe slightly (very slightly) more of an effort.  These look nice enough to wear "dressed up," but also feel sporty enough that you could run or climb a rocky trail.