okay...so i've found this beanie that I want to order, but the sizing is in S, M, L, XL
See the beanie here

I emailed the site to ask if there are sizing guides based on the circumference of the head, of which they just came back and said that there isn't and it should be pretty true to size.

Except I have no idea whether my head is a small or a medium (i don't think its a large nor an extra-large!) and I don't want to order the wrong one!

Any one got any ideas or know roughly head sizes for hat sizes (if that makes sense!)

Ta,