) Fly Armor attaches to horse gear to repel flies, gnats and mosquitoes. Each Fly Armor Boot Band holds 2 replaceable Citronella oil inserts (included) for up to four weeks of protection. Replace the inserts when they lose their effectiveness. Back side of band is made of hook-and-loop material. Comes with removable, self-adhesive hook-and-loop for attachment. Can be fastened to your sports medicine boots or other gear that has soft hook-and-loop surface. Vaporguard backing provides a barrier between noseband and your horse. Pair. 2" x 7".