Update 08/22/2019: We've re-tested the noise isolation of the Bose QC35 II after noticing a flaw in our testing methodology. While the 4.5.2 firmware update reduced the ANC performance slightly, it's less than we initially reported. This review has been updated to reflect these changes.

While the ANC doesn't work quite as well as it did before the 4.5.2 firmware update, it's still outstanding and is among the best we've ever tested. These headphones do an excellent job of blocking out the low rumble of bus or plane engines, great for giving you peace while traveling or commuting. They do an exceptional job at blocking out background chatter and high frequency sounds like AC units and fans as well, making them great for the office as well. If you want a pair of over-ear headphones that do an even better job at cancelling out sounds in the bass range, check out the Razer Opus Wireless.