I've had a pair of Acorn slippers of this style for years and years. I bought these to replace the absolutely worn out ones I had. I wear a 10-1/2 or 11 men's shoe, varying with the shoe and bought the 10.5 - 11.5 size. These are too large (sole too long). They probably are about a 12 or 12.5 despite how I ordered them or how they are marked.
Sizing isn't correct