Size S: 9 x 28 cm / 3.5 x 11 inch,The visor edge of hats: 4.5cm / 1.7 inch. Size M: 10 x 31 cm / 3.9 x 12.2 inch,The visor edge of hats: 6cm / 2.3 inch.Size L: 15 x 48 cm / 5.9 x 18.9 inch, the visor edge of hats: 7cm / 2.7 inch.Size XL: 16 x 54 cm / 6.3 x 21.2 inch, the visor edge of hats: 8cm / 2.8 inch. Designed for small medium dogs. With two holes at the top, breathable and comfortable. Cute and fashion dog hat for your puppy. Special hat to make your dog unique and attractive.