I recently purchased 2 sandals same size in 2 different colors, but the sizes are not accurate. For some reason pink one is shorter than the blue one. Not too sure why, the size on the sandal is both listed as 260M.

Bought these for my son for college. He works as a lifeguard and started wearing them for work. He says they work very well and are fairly comfortable (as long as it is not an 8 hour day).