The attenuator rings were the same for both headphones, copied directly from the first set to make the second set of attenuators, so there was no change in size or shape. Leather does breathe and feel better than pleather, but still not as breatheable as microfiber or Alcantara - ears will still be a little 'sweaty' but not 'pleather sweaty'. Alcantara is probably the best material I've come across for comfort in pads, it really does a great job for comfort. Thing is, with the TH-X00 the leather pads seem to sound the best to me, more open and breathable pads just don't sound the same because they simply lack the subbass experience you get with the leather pads. There are some pads I want to try out now from Yaxi since I love what their pad for the Koss Porta Pro does and would be willing to take a chance on them. They have both leather and Alcantara hybrid versions, so might as well get both... https://www.yaxi.jp/product-gallery/th900-610/ I wear thin frame glasses and have not really experienced any differences in rubbing sounds between pads I've tried. I often try to listen without my glasses to since I'm near sighted and generally don't need them for seeing anything within arms reach.