Too roomy
"I ordered the greenish/rainbow colored sandals and was so sad that they didn’t work. I’m normally an 8. 5M but read that I should size up. I purchased the 9 and that was the correct size, but they were way too roomy under the straps. If you have thin feet, these probably will not work for you. The quality was excellent and I’d buy all colors if they make some for narrow or skinny feet!"