Almost brand new pair of Birkenstocks. My husband wore them around the house a couple times but didn’t like them but we missed the return cutoff window. Something splashed on the left footbed but we’re not sure what. Whatever it was has absorbed into the suede and there is no residue remaining. Let me know if I can answer any additional questions! From the Birkenstock website: Our most sought-after clog, the Boston lends a fashion-forward edge to any style. Handcrafted for quality, oiled nubuck leather looks distinctly heritage, designed to age over time for a perfectly worn, one-of-a-kind look. Featuring an additional foam layer for cushioning, the soft footbed offers extra comfort plus go-all-day support. Cushioned BIRKENSTOCK soft footbed creates custom support with wear Oiled leather upper, colors may vary Suede footbed lining helps keep you comfortable EVA sole is flexible and lightweight Adjustable strap with metal pin buckle “Made in Germany” quality stamp on footbed