I had to work hard to get these shoes to fit. They were loose enough that my foot would suddenly slip out of them as I walked and I  feared that at age 76 and rather debilitated, they would cause me to fall.I bought a pair of gel type comfort pads that cover the entire area where the foot is but they were still too loose so I bought a second pair and this snugged them up enough that I can wear them comfortably and safely now. A customer should really not have to go to the extra expense and work to make a sandal feet. I have always worn a 7.5 and the chart says a US 38 is a 7.5.