These measurements are footbed dimensions.
We recommend choosing a footbed size by adding 10mm to the length of your foot, and selecting narrow or regular based on your foot width.
* All measurements are in mm
Birkenstock Measurements - NARROW FIT
Size 35 - Length 225, Width 85
Size 36 - Length 230, Width 87
Size 37 - Length 240, Width 89
Size 38 - Length 245, Width 91
Size 39 - Length 250, Width 93
Size 40 - Length 260, Width 95
Size 41 - Length 265, Width 97
Size 42 - Length 270, Width 99
Size 43 - Length 280, Width 101
Size 44 - Length 285, Width 103
Size 45 - Length 290, Width 105