Fly mask
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A fly mask or fly cap is a mask used on horses to cover the eyes, jaw, and sometimes the ears and muzzle to protect from flies. The mask is transparent and made from a mesh allowing the horse to see and hear while wearing it. The mask may also provide some protection from UV-light.
The mask is not generally used while riding, as the stiff mesh interferes with the bridle, though sometimes two different styles designed for use with a bridle, are occasionally seen. One design is a crochet-like cover for the ears only, designed to be worn under a bridle without rubbing. The other is a soft, very fine mesh face and nose-covering mask designed to be worn with a bridle, not sturdy enough to withstand turnout.
Fly and mosquito protection is an important part of overall horse care, as biting insects are both a source of irritation and also may transmit disease.