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
Arch Supports and Insoles | shop online at BIRKENSTOCK
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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