car seat liner / cover opinions please

[flowerpower10]

I am having a summer baby I got Cybex cloud Q car seat with isofix base but the fabric is a bit like denim and I am worried that the fabric will be rough and cause baby to be sweaty
Do you think I should get a cover /support / liner in cotton or terry cotton like they have on Amazon ?

[CottonSock]

I got similar and it seemed to make it harder to tighten straps so be cautious

[AliceMum09]

If you're going to buy a summer cover it needs to be the official one from the manufacturer, if they do one. I know Britax and Maxi Cosi do.