I had the same thought as SigArms228
Aluminum is the very worst thing to have in your hand in cold weather. So depending on where you are, it may or may not be a good idea.
I would not care much if the gun were worn in a concealed condition under clothing, but here where I live, I'd never want aluminum on a holster gun in the winter. Your profile says nothing about where you are, so this warning may be of no value to you.