Do water shoes (not socks) expand some so when purchasing you should go down a size?

I wear 8.5 shoe but water shoes do not come in half sizes so wandering if I should go down to an 8 since the shoe may expand some IN WATER. Nothing worse than to get a size 9 and be in the water to lift my foot up in water and the shoe come off. Please advise. the size 9's I purchased are already a big too big so have ordered an 8.

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    Could you provide an example of the kind of water shoe you are looking at? Commented Jun 26, 2017 at 19:06
  • Welcome MEL56! Thanks for joining our community. As @JoshKurland asked, an example of what a water shoe is would be helpful. You could add a link to a specific type, or even a picture. When it comes to what affects sizing, the material can be most important. What are the water shoes you're thinking about made of? Thanks for giving us more information. Hopefully we can help you! Commented Jun 27, 2017 at 0:04
  • the shoes I have are Speedo and Cudas. Its only for a beach week. I have the expensive water sandals but in the ocean I like my whole foot covered. I just want to know if the $25 ish shoes I have bought will be a little bigger when they get wet. I bought an 8 online and hope they are better than the 9's.
    – MEL56
    Commented Jun 28, 2017 at 0:39

1 Answer 1


Since you are looking at shoes that only come in full sizes, I'm guessing you're looking at very cheap shoes. A cheap water shoe is usually made of a rubber sole and an upper of neoprene (somewhat stretchy) and very stretchy fabric. If your foot fits on the sole, the upper should stretch enough to accommodate the rest of the foot. The sole will not stretch whether it's wet or dry. The upper will stretch both while wet and dry.

As to whether you should buy a size up or down, that depends entirely on the brand and manufacturer. It's likely that either shoe will be OK, but will not fit well. The only way to know is to try before buying.

Nicer water shoes will vary more in how they're made, and may use less flexible materials in the upper. They are generally more durable, more secure, and more likely to come in half sizes.

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