Car covers for the Mini Cooper sit at the boring end of accessories, but the wrong pick creates work rather than saves it. The current Cooper falls in the supermini class at under 4200 mm, which sets the sizing bracket.
Three products we would look at first in this category. Fit for your Mini still comes first: check the compatibility list on the listing against your exact model and year, and read the model guide above.
MaypoleBreathable Full Car Cover (medium)
Breathable, water-resistant cover sized for medium cars.