Terrible for tiny biting insects

I really thought this fly mask was going to be great. The description indicates that it will keep out gnats and noseeums. The mesh over the face is very fine but seems strong as well. The mesh on the ears is soft, but the holes are apparently too big for the tiny bugs. I came home from work today to find my horse frantically shaking his head. I removed the mask and found it full of gnats. My horse's face and poll were bloody. There were also blood spots on the mesh. The pictures I posted are of the onside of the mask. The white fleece liner is full of gnats, and the inside tip of the ear was crammed with them and dried blood from my horse's ear.

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