They definitely look like a different type of leather than other SPA models, mine have a matte finish and the seat middles are spotless, only some creases on the edge of the bolster (not cracks) just leather creases.
Try pouring hot water from a kettle into a washing up bowl or such like, put in a small sized towel into it, ring it out briefly and place it whilst steaming hot onto the leather seat base and leave to cool. Repeat this a few times i expect you will see a vast improvement to the leather on the middles.
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