MobiMatter does not provide any unlimited data eSIM for the Cayman Islands.
All of the listed plans have a fixed data allowance: the Best World 50 GB 180 days plan gives 50 GB for 180 days, while the Caribbean 20 GB plan provides 20 GB for 30 days.
If a traveler needs a large amount of data, MobiMatter’s fixed data plans such as the Best World 50 GB 180 days or the Caribbean 20 GB can be more cost‑effective, especially for moderate usage. Only very heavy data users might consider a different option, as these plans cap usage at the specified amount.