I have worn Ryka aqua shoes for more than 15 years.  This Aqua Fit 4 design is defective.  You can hardly get your feet into these shoes.  The elastic laces are too short and if you force the shoes on (breaking nails in the process), they are too narrow and uncomfortable, in spite of my sizing up 1/2 size.  Spare yourself the trouble of sending them back.  This would have been my 5th purchase of Ryka Aqua shoes.  Back they go!