Did you try googling your need?
Maybe try airport friendly work boot?
Or composite toe boot?
Or better yet - ask you co-workers, they have to wear the same type boots, they'd be the best to know.
And for that matter, a big company like FedEx doesn't give some advice as better brands to buy? For a good boot that is going to last you are going to be shelling out at least $100, but that is tax deductible as a work expense if it is not reimbursable by the company.
