The TropiClean Natural Flea & Tick Repellent Collar is a powerful and long-lasting way to protect your pet. Made with natural ingredients, this collar provides full-body protection against irritating fleas and ticks. The adjustable collar offers a flexible fit for both small and medium dog breeds. The water-proof solution means that the collar stays in place while your pet plays. The clean solution is a healthy alternative to synthetic products made with pyrethrins or permethrins.