These slippers are VERY comfortable!! They are 100% hypoallergenic and so soft!! You can see by the pictures that the size listed on the box (3-4.5) is completely irrelevant. I am listing them (and I consider myself an expert in all things SHOES😁😂), as a Women's MEDIUM (shoe size 6-8) and/or BOY'S LARGE (shoe size 4-6) because when it comes to slippers, they are usually sized with a little leeway in either direction.