Comfort Zone MultCat Calming REFILL 48ml 1pkComfort Zone MultiCat Calming REFILL 48ml 1pk Reduce Multi Cat Tension & Conflict Cats are very territorial creatures so when adding another cat in the home can disrupt their routine and cause tension amongst them. Comfort Zone Multi Cat products are 88% effective at reducing multi cat tension and conflict in multi cat homes by creating a calming environment.