We get company provided Sennheiser HME 25 however those break apart quite often and if you wear glasses hurt quite a lot after a few sectors. Therefore i bought me a new Telex 850 ANR which doesn't need any battery boxes to work its ANR. So far i'm very pleased with it, its light weight, not too much pressure on the ears and quite good ANR effect without any problems on our 737 classics. The only thing is if i key the handmike the ANR breaks down since apparently the headset mike isn't powered anymore so i just dont use it. Same of course is true if you wear the quick donning mask.