Chelsea FC Unisex Reversible Knitted Hat

what size is this close to small medium or large?

What colour is the hat? The picture shows both black and blue. Or is it black on one side and blue on other?

Is the hat a skull cap type hat or is it a little bigger to pull way down over your ears.

Is this hat reversible? This is what they advertised and one review showed a picture and it wasn't, wow