From Protective Pet Solutions. I have 2 of these for sale at $40 each. The sizes I have are -Pony, and Cob. You can see the sizing chart on their website for measuring. They, don't fit my ponies that's why I'm selling. I live in the Cowichan Valley. To view this fly mask go to this link. https://protectivepetsolutions.com/products/solar-vizor