保険

How it works

に (in) marks what you belong to here — 旅行保険(りょこうほけん) (travel insurance). The verb is 入る(はいる) (enter, join), but it shifts into the て (te-form) plus いる (be), giving 入っています(はいっています) (am enrolled in). That 〜ている (ongoing state) form describes a continuing state, not a one-time action, and ます (polite) keeps it polite.