Size 11 U.S. is more like 10.5 U.S.  They make my feet sweat which produces a squeak in the heal.  Adding talcum powder inside helps only a bit and temporarily.  Canvass is stiff and scratchy.  They may get better with age, but they are too uncomfortable to invest that much time.  On the plus side, they look good for what a wanted -- a beach shoe worn sockless in and out of the water.