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Amazon.com: Birkenstock Replacement Footbed Kork for Super Birki Black - 46 : Clothing, Shoes & Jewelry
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Amazon.com: Wool Flat Shoe Insert for Sandals & Sockless Shoes, Comfortable Shoe Insoles with Sweat-Absorbent Natural Fiber & Non-Slip Silicone Grip, Narrow-Cut Shoe Inserts for Women, Brown, Size 42 - SoxsolS :
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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
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