MADE IN THE USA IMMEDIATE SHIPPING. Deerfly Patches are a non chemical, odorless protection from biting deerflies. They are a disposable 2 inch x 6 inch adhesive patch that, when placed on the back of the hat or cap, they trap the deerflies as they buzz around your head. Virtually every deerfly will land on the patch because they target it as a good biting place. Deerflies are sometimes called Marsh Flies, Sheep Flies, May flies, Sand Flies, or Greenheads. They all bite. Conventional repellents do not work well on them. Used by gardeners, fishermen, hikers, campers, runners, bikers, canoeists, horseback riders, anyone outside. One patch will last 1-3 days on your cap. Shelf life in the package, several years. Orders before noon will ship same day. Orders in afternoon will ship the next day. Shipped as three 4pks.