Cashel's Crusader Fly Masks are among the top-voted fly masks year after year and are trusted by horsemen of all backgrounds to protect their horses from flies. Made from soft coated nylon micromesh, it's a very comfortable choice for fly protection for your horse. The patented three-hole cap and double dart construction keep the material away from sensitive eyes, lashes, and temples without damaging the forelock, providing a more natural and complete field of vision. The Crusader blocks up to 70% of the sun's damaging UV rays, protecting horses from eye problems and sunburn. This mask is great for horses that have greater sensitivity to the sun and lighter-skinned horses. Our fly mask closure strap features pre-stitched guidelines in 3/4-inch increments, allowing you to trim excess length for a perfect custom fit. Sizes: XXS (Foal/Mini Horse, 27"), XS (Weanling/Small Pony, 34"), S (Yearling Horse/Large Pony, 35-37"), M (Small-Average Quarter Horse/Arabian, 38-40"), L (Average-Large Quarter Horse, 40-42"), XL (Warmblood Horse, 42"), XXL (Draft Horse, 50"). See size chart for details on how to measure.