![Amazon.com: Birkenstock Unisex Birko Sport Arch Support - Sport Blue Insole 43 (US Women's 12-12.5, US Men's 10-10.5) Medium : Health & Household Amazon.com: Birkenstock Unisex Birko Sport Arch Support - Sport Blue Insole 43 (US Women's 12-12.5, US Men's 10-10.5) Medium : Health & Household](https://images-na.ssl-images-amazon.com/images/I/717SIxczxjL._SLDPMOBCAROUSELAUTOCROP288221_MCnd_AC_SR462,693_.jpg)
Amazon.com: Birkenstock Unisex Birko Sport Arch Support - Sport Blue Insole 43 (US Women's 12-12.5, US Men's 10-10.5) Medium : Health & Household
![Boston fit improvement. I have quite narrow feet and these inserts, though not ideal (minor sticky separation sound when you lift off while walking) have made them functional to use. They otherwise slid off, esp the right shoe since that's my slightly smaller foot ... Boston fit improvement. I have quite narrow feet and these inserts, though not ideal (minor sticky separation sound when you lift off while walking) have made them functional to use. They otherwise slid off, esp the right shoe since that's my slightly smaller foot ...](https://preview.redd.it/boston-fit-improvement-i-have-quite-narrow-feet-and-these-v0-ti3fwyoe6kf91.jpg?width=1080&crop=smart&auto=webp&s=db841e6c10d403be1bdfb523a2a743a201f81c29)
Boston fit improvement. I have quite narrow feet and these inserts, though not ideal (minor sticky separation sound when you lift off while walking) have made them functional to use. They otherwise slid off, esp the right shoe since that's my slightly smaller foot ...
![Amazon.com: Birkenstock Womens Shoes Blue Footbed-Heeled Flat, Blue, 43 EU/Mens 10 M US : Health & Household Amazon.com: Birkenstock Womens Shoes Blue Footbed-Heeled Flat, Blue, 43 EU/Mens 10 M US : Health & Household](https://m.media-amazon.com/images/I/817+W1PbB2L._AC_UY900_.jpg)