I’m a fan of biothane for leashes and collars. It’s a good leather alternative, since my dog likes to chew leather but doesn’t care for biothane. They can get wet and don’t get stiff at all in the cold, and where I live it’s currently -40 F. Love that they’re washable since lord knows my dog loves to roll in anything disgusting.

But I’d stay away from the kind found in major pet stores, as it’s pretty thin and feels cheap.

I got mine from this local Canadian maker.