They have paulownia wooden soles. These traditional Japanese shoes are the equivalent of European clogs.
Healthy for the feet and very comfortable to wear during summer.
Traditionally, these getas are not worn tight: your heel may protrude a bit at the back (usually up to 2cm).
M : 26cm of base length = Sizes 39 to 41
Heel height: 4cm
Front height: 2cm
Feel free to measure your foot to be sure!