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leather ventilated
Can't compare to previous models, but have the 2022 x3 m40i with ventilated vernasca leather. It took some adjusting, but I have found a comfortable position. Had to tilt the seat back further than I normally do. You can feel the lumber support mechanism directly on your spine if you have zero adjustment on it. However, once you start increasing the lumbar support, the mechanism seems to move forward and outward toward the sides, which gives more of a softer suspended feeling, and keeps the mechanism from pressing directly on your spine. If you move the lumbar too far forward, it seems to press on your kidneys. I'm 6' 2" with a long torso and 175 lbs. I've had lower back surgery, so am probably more sensitive than others. It's primarily my wife's car and she has no problems and is 5' 10".
I did do some looking at the online parts supply stores and youtube videos on seat cover replacement to get a better understanding of how ventilated seats work. They have a wide ribbon comprised of small cellophane\plastic tubes with holes in them. The ribbon is laid between the foam cushions and perforated leather and runs down the length of the seat back and bottom cushions. A blower blows into the ribbon pack and distributes the air throughout the seat perforations. I think the ribbon does add some stiffness to the seat compared to those without it. For me, I like the ventilated seats due to hot muggy summers even though there is a bit of a trade off.
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