The size is listed as 27cm. I'm selling this because I received it as a gift and didn't use it. Although it's unused, I washed it once to make it easier to wear. Please check the photos for some yellowing and minor stains, as well as some slight fuzzing. I think it should be fine for use. Please understand that this is a used item and has been stored at home! Also, please note that this will be folded for shipping.