I wasn't disappointed by this fly mask. I guessed on the sizing, although Cashel provides an impressive size and measurement chart on the back of the package. The mask fit Whisper just about perfectly, securing well beneath her jaw but also leaving her enough room to graze and chew comfortably while wearing it. The double Velcro closure is well designed to be secure, but a strong elastic piece will also help the mask to fall away if your horse gets hung up.
This mask features darts to help keep the mesh up away from the horse's eyes, and it works well - there's plenty of clearance when Whisper's wearing it. Unique to this mask is also the hole for the horse's forelock. This hole allows for the forelock to be kept out of the horse's eyes, and I think it also helps to keep the mask from shifting about.
And while fly masks aren't cute by definition, this one is...more attractive - dare I say "stylish"? - than most. I picked up the pink mask, not because Whisper particularly likes pink, but because 5% of the proceeds go to the Susan G Komen Breast Cancer Foundation. The donation helps to justify the slightly higher price tag than other fly masks - $25.95. Protecting my horse AND fighting breast cancer? There's not much better than that.