W. Ten Mile Road, Leroy, Michigan 49655. Shipping is free and within 24 hours. Deet-based repellents are effective for a few hours, but the user should not apply indiscriminately since human allergies can develop. Permethrin-based repellents applied only on clothing usually last longer. Horse flies are usually attracted to shiny surfaces, motion, carbon dioxide, and warmth.
Some people report attacks while in swimming pools.
Some rest on back porches, etc., especially in mid to late August. There are also nylon head nets that keep insects away from the neck and face yet are suitable for clear vision and reinforced for pipe or cigarette smoking. A handy mesh jacket slips on easily over regular outdoor clothing and is very effective when a strong repellent is applied. Store the jacket in a sealed plastic bag. Gloves are useful, as are tightly woven, long-sleeved shirts and long pants.