Absorbine DuraGuard Fly Spray is the first sweat-proof, waterproof, and worry-proof fly spray that is proven to kill and repel virtually every species of insect known to torment horses, even under the wettest conditions. DuraGuard is proven to kill on contact and repel up to six times more species of biting and annoying flies and pests than Endure. DuraGuard is formulated using our exclusive DuraBond Technology to bond the active ingredients to the hair shaft. Water rolls right off, leaving the protection where it belongs. DuraGuard stays active for up to 14 days and is effective on horses, ponies, dogs and as a premise spray.*Endure is a registered trademark of Farnam Companies Inc. Comes in 32oz spray.