Fourth generation (XP210, 2020-present) · Supermini / small hatchback
The fourth-generation Yaris (XP210, 2020-onwards) is UK-hybrid-only. Every trim uses the same front seat shape - and it is a completely new design from the 2011-2020 Yaris, so older covers do not fit.
First generation (XP210, 2021-present) · Subcompact / B-segment SUV
The Toyota Yaris Cross has a 40/20/40 split-folding rear bench on Excel and above and a 60/40 split on the trims below, so match a rear cover to your trim's split. The sliding two-piece boot floor is a boot feature and does not affect the passenger seats or their covers.
Three products we would look at first in this category. Fit for your Toyota still comes first: check the compatibility list on the listing against your exact model and year, and read the model guide above.
SakuraSS5370 Heavy-Duty Waterproof Seat Cover Set
Full set with headrest covers; listed as side-airbag compatible on the front covers only.