Seresto® gives your cat up to 8 months of continuous protection against fleas. Seresto® is an innovative polymer matrix collar that offers a continuous supply of two active ingredients – imidacloprid and flumethrin. Low doses of these actives are released from the matrix over time and migrate into the lipid (fatty/oily) layer of your cat’s skin and hair.With its advanced delivery system. Seresto® works through contact – killing fleas that can cause painful bites and spread diseases. Seresto® gives the longest-lasting flea protection for cats. It’s time to get serious, get Seresto®.