These hats are the pinnacle of form and function! They are utterly adorable, but also incredibly WARM! Each are knit with hand dyed merino and a strand of fluffy mohair, giving the hats an extra snuggly quality.
About the sizing...
These all fit me and my daughter. I would describe our heads as large and right-sized, respectively. The green ones are a tad tiny for me (as in, a bit of earlobe exposed) and the blue one is a tad roomy for her (as in, full eyebrow covered).
I've categorized each one as either Adult S/M or Adult M/L to indicate where each falls on the spectrum.