WestJet has unveiled a new low-cost fare option for its flights. It’s called UltraBasic, and it lives down to the name. Here what to know.

With the addition of UltraBasic, WestJet now offers seven tiers of service. Next up is Econo, then Econo Flex, then Premium and Premium Flex, and finally Business and Business Flex. The company says UltraBasic replaces its Basic fare, “with changes to carry-on baggage allowance and boarding zone modifications.” In other words, it’s even more basic.