FELIWAY OPTIMUM Diffuser Starter Kit for Cat ComfortFELIWAY OPTIMUM Diffuser Starter Kit for Cat Comfort Based on 20 years of knowledge about cat behavior and stress, the FELIWAY team has developed the new FELIWAY OPTIMUM. The new FELIWAY OPTIMUM contains a cat pheromone complex that conveys comforting messages to the cat , which helps your cat feel comfortable and safe in its home , providing comfort and ensuring harmony between cats . FELIWAY OPTIMUM obviously helps cats to reduce even more stress