Cold feet

I worry about our feral cats' little feet in this sub-freezing and snowy weather. I decided to put down a bathroom rug where I feed them so they can get a little break from the snowy surfaces where they walk.
My husband used the snow blower the other day to clear the driveway; but he also made a few paths where they can come to our door from the back yard.
Poor Lucky.
He's been the recipient of our food for the past 5 years, but he's still afraid of humans. He can't be petted. The most we can do is keep him going with nutrition. All of the strays who visit us were friends with Angel, our black and white kitty who recently passed away.