JackulaThe reason I weighed mine was because I found the K7XX to be uncomfortable. It made my neck and head hurt after a short period of time.
I found a review where someone else weighed the K7XX and it was 290g for him. https://www.head-fi.org/showcase/akg-k7xx.20409/reviews?page=2
I find my Bose QC35 and Sennheiser PC37x to be much more comfortable and I can wear them for long hours without any strain. I weighed them for comparison. Bose QC35 measured at 236g and Sennheiser PC37x measured at 253g.