Just checked. The lighter weight version is 10.5oz with a red selvedge line. The heavier ones (real 'effing stiff) are 10.8oz with no colored selvedge line. They are definitely selvedge though.It seems strange to me that the weight-difference of .3oz would make such a contrast to how they feel. They did have some 9.? oz available too - tried them on but didn't purchase.