If your office is noisy because doors are opening and closing, people are talking a lot, and music and radios are playing everywhere... just get earbuds with Comply foam tips. Or, merely closed back headphones.
If your office has a loud air conditioner; or vacuum cleaners going all the time; or an airplane engine constantly making the same, EVEN-TONED noise... then fine, get noise cancelling headphones.
Google "Sony noise cancelling headphones".
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