To measure your head at home take a measuring tape around the circumference of your head at a finger's width above your ears, above your eyes, and around the widest part of the back of your head. Don't make it too tight.
All of our felt hats are 100% beaver felt therefore naturally water resistant but not fully waterproof. Wearing in the rain is okay but we do not recommended getting the hats soaked. Additionally, do not leave your hat in the car as it can over heat & cause the hat to shrink.
For small stains or marks on the felt hats we suggest using a small piece of sandpaper to rub it out. For the straw hats we advise using a spray bottle with water and squeezed oranges to spritz the hats bimonthly for added longevity.