IR Tabs are infrared strips on the (I think the pockets) that show really brightly on night vision or cameras at night. It's basically for friend-foe establishment. I guess in the army you just have to remember 'don't shoot at the shiny things and you'll be okay.'
Sorry I was at work late last night, I'll try to get you some pictures tonight.
The IR tabs came to light after we greased a bunch of Canadians in Afghanistan. After that, we all taped glint tape to the top of our helmets so we would shine to the Aircraft. Then we sewed small pieces onto our sleeves for Iraq, and then came along the ACUs with IR. Now we are back to nothing on our helmets
60 and I'll include shipping. The other set is a little more worn, and the cut is slightly different because they were the original run of ACUs. They look identical, but you'll feel a slight difference. The set in the pictures on the other hand are pretty much new, maybe washed twice at the most.