Effective Bug-Repellant Neck Gaiter features a proprietary permethrin formula bound tightly to fabric fibers for unparalleled protection from harmful biting insects. Repels mosquitoes ticks fleas and flies. Made with stretchy breathable fabric that can be worn around the neck or head. High-visibility reflective strips make your pup easy to see at night. Comes in three convenient sizes S-M-L. Content - 90% polyester and 10% spandex for a comfortable fit.