This product provides built-in, invisible and odorless insect protection. Designed for the comfort of the horse, the mask repels mosquitoes, ticks, flies, and fleas and can fit horses weighing between 900-1,200 lbs. Repels mosquitoes, ticks, flies, and fleas (including insects that cause Lyme disease and West Nile virus). Comfortable design keeps the mask off the face and away from the eyes. Fits horses weighing between 900-1,200 lbs. Designed for a secure fit with strong Clear View Vision mesh.