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These are not for the Zermatt Slippers.
Genuine Birkenstock shearling lined replacement arch supprts for shoes and boots with removeable insoles. This arch supprt is made in Germany out of the legendary Birkenstock Birko-cork.
Unsure about your size? Check out the Birkenstock Fitting Guide to help you. https://www.birkenstock.com/us/us-service-fittingguide.html