Why Fly Mask Sizing Actually Matters

A poorly fitted fly mask is more than just uncomfortable — it can cause painful rubs behind the ears, eye irritation, and even behavioral issues. Horses wearing the wrong size often shake their heads, rub against fences, or refuse to wear protection altogether. Proper sizing ensures full coverage of the eyes, ears, and nose while allowing your horse to graze and move naturally.

How to Measure Your Horse for a Fly Mask

Step-by-Step Measurement

1. 01
   Soft measuring tape (tailor's tape)
2. 02
   Helper to hold your horse steady
3. 03
   Halter removed for accurate measurement
4. 04
   Measure around the neck from the poll (behind ears) down under the jaw at the same poing on the other side.

Measure twice — horses can be fidgety!

Standard Horse Fly Mask Sizing Chart

Note: Always check the specific brand’s sizing chart.

Pro Fitting Tips

• Two fingers should fit comfortably under the mask at the poll and behind the ears.
• The mask should be designed to keep mask off eyes, lashes, and forelock without blocking vision or rubbing the eyelashes.
• Choose masks with adjustable closure strap for a custom fit.

Recommended Fly Masks

Crusader Fly Mask
Standard

Best overall

Crusader Fly Mask
with Ears

Ears for insect protection

Crusader Fly Mask
Long Nose

Added sun protection