These shoes are stretchy, and should fit snug. If you are between sizes you probably want to pick the smaller size.
Low Cut Okespor Water Shoe
The Okespor Kite Low is a slim fitting bootie that is great for windsurfing or kite boarding. This neoprene shoe with a tri-directional velcro strap stays snugly on your foot whatever you are doing. The slim profile means that when you are windsurfing your foot will still go in and out of the footstraps easily. Protect your feet without losing performance on the board!