Style 846143 in black Birko-Flor or 846153 in silver Birko-Flor. Birko-Flor - a synthetic material made of acrylic and polyamide felt fibers that is comfortable and tear resistant. This material has a synthetic leather-like finish with felt lined backing. Wipes clean with mild soap and water. Birkenstock narrow footbed. EU sizes 26-34 equivalent to US sizes 8.5-3.5. NOTE: SILVER IS SOLD OUT.