These leather hats are from Cotacachi, Ecuador. We measure the inside circumference of the hats in inches. Sizes are approximate. The diameter of the outside brim from front to back is about 14" to 15", and from ear to ear is about 12" to 13". To give you an idea of the size, a 23" circumference hat measured 15" long by 12" wide with a 12.5" long strap, and it weighed 0.56 pounds. Please see the Hat Size Chart tab for the conversion chart. Video: How We Measure the Hats in Inches ...