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
Birkenstock Blue Footbed Inserts - Shippy Shoes
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Arch Supports and Insoles | shop online at BIRKENSTOCK
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Amazon.com: Birkenstock Blue Footbed Casual (Sport), Wide Width, (36) Women 5-5.5 : Health & Household
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Arch Supports and Insoles | shop online at BIRKENSTOCK
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