Equilibrium Field Relief Midi Fly Mask With Ears in Black. The Field Relief Midi Fly Mask is a lightweight and comfortable fly mask with ears that offers excellent protection from flies. The Midi Fly Mask features soft padding at the brow and noseband to prevent rubbing or chaffing and offers adjustable fastenings under the cheek and behind the ears to ensure a secure and comfortable fit. The Mask sits clear of the horse's eyes and eyelashes and the mesh used in the Midi Mask offers high visibility making it ideal for veterans, the visually impaired or spooky horses. Read more… The Midi Mask screens out 70% of the sun's rays.