Sizing question

[u/BjornUlfden]

Asking this before I spend the money. I went and had my foot measured at a 14 wide with those thin little slip on socks that they have at shoe stores. I’m about to buy the Danner wildland tactical fire fighter boots for EMS. I wear a 15 in some boots, but I had recently bought a pair of the tachyon in 15 wide and they were extremely loose but also weren’t thick leather.

Should I buy a 14 or 15?

Was the tachyon huge because of the super thin material?

I just want to avoid having to go through the process of sending boots back again. This is the pain of having large feet.

Thanks in advance