Kensington Bug Eye Fly Mask The Kensington Bug Eye Fly Mask is the only seamless and molded mask available today! With no darts or seams at the eye, this mask gives maximum protection and an unconditional guarantee that separates it from all the others. Features webbing trim and is made from Textilene (R) material which is specially formulated to withstand fading, soiling, wear and tear, and is mildew resistant. The fly mask not only shields your horse from biting insects, but also shades your horse with 73% UV protection. Allows full visibility, helps aid in healing and with the original double locking system, this mask is nearly impossible to take off. Medium size fits horses 700-900 lbs.