Head opening is 21 inches unstretched, stretches to 28", cinches smaller with tie-string
The hat is 8,5 inches deep. Widest point of hat laying flat 10,5". Still has stretch in length and width.
Moderately sized tam, it should hold short dreads, moderate locks or hair with not too much volume, it will fall like a slouchy beanie in the back when the hair is worn hanging down.
Hand washing and flat drying only, I will send care suggestions.