NWOT Rieker Chelsea boot size 11

Brand New Chelsea Boot, never worn outside the house. Bought it in Europe ,great quality. Unfortunately,it's too small for me. Europe size 42 I usually wear a 10 or 11. Color: black heel height:4.2cm heel type:boot heel fixing:zipper lining:Yes lining type:Textile https://www.dosenbach.ch/fr-ch/p-m02340945/02340945