US: 11 to Europe Size 41

US: 11: Features a foot length of 26.7 $\text{cm}$ (10.5 $\text{in}$), ball width of 10 $\text{cm}$ (3.94 $\text{in}$), heel height of 6 $\text{cm}$ (2.4 $\text{in}$), and Flat-to-Medium Arch support optimized for women’s footwear.

Europe Size 41: Features a foot length of 25.9 $\text{cm}$ (10.2 $\text{in}$), ball width of 9.7 $\text{cm}$ (3.82 $\text{in}$), and heel height of 7.5 $\text{cm}$ (3 $\text{in}$), and Medium Arch support optimized for women’s footwear.