Professional's Choice Fly Mask Equisential Line Breathable Mesh Hook and Loop Closure Forelock Opening Sizes: Horse, Cob Charcoal EQFM The Equisential Fly Mask from Professional's Choice is designed to protect against flies and other biting insects. Its smooth, breathable mesh material is strategically placed to keep the mask off the eyes while allowing full vision. The hook and loop closure ensures a secure fit, while a forelock opening allows for comfortable wear.