This is a very cheap shoe for SPD spikes. The design offers a completely natural gait with the spikes installed. I buy my exact size and wear it with cycling socks. They fit perfectly. I don't think you can rule out swimming in the shoe, but you can feel the interface is solid. I wish there were more of these shoes on the market. In appearance, they look like comfortable shoes with reflective laces. Fully synthetic and breathable. Warning, these shoes are not waterproof. I got caught in the rain a few days ago and they are still drying. I think the spike's channel goes straight into the sole of the shoe.