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My QH is notorious for rolling and depositing his fly masks in the pasture. My Shire/Hano is more careful and keeps hers on in general. For that reason, and because who has time to traipse around acres of tall grass looking for the elusive fly mask, I put both mine in this. Full ear coverage helps keep them cleaner, nose coverage keeps insects and sun off their noses (yes, even dark noses get sunburned), and more importantly the fit it better. The bulky masks seem to provide leverage against the ground when rolling, so they slip off more easily. These are flush against the face and therefore less likely to flip off. Second, they work nicely on buggy or sunny trails. Regular fly masks impede vision so they trip over everything. This mesh mask if much better for vision and the above mentioned bug/sun protection. These also come without ears and nose extension depending on your horse's comfort but I'm a big proponent of the nose extension.
Very flexible mesh fly mask, very comfortable for my horse. The ear covers are quite long so not rubbing the soft fur off, the nose cover is long enough to offer protection without getting in the way when feeding or drinking. The black netting also offers much better vision. Expensive item well worth it!