"Flat top hat with hand knitted sides and sewn with a flat wool top. The very top of your head can breathe a little extra, even as your ears and most of your head is enveloped in silky warm alpaca. When ordering, indicate which number(s) you choose. SIZES: Of course, they are knit and stretch to some extent. You can observe in the pictures that some are deeper from rim to top than others. These measurements are outside diameter, so if you are measuring exactly to your head my measurements would be snug. The Large size hats are 21\" to 22.5\" (54cm to 57cm) outside diameter; Medium are 19.5\" to 21\" (51cm to 54cm) and small are 18.5\" to 19\" (about 24cm) outside diameter. Extra Large, X-L, are 22\" (56cm). Artist: #2 and #3 are made by Florentino Florentino Florentino is the father of R