+1 on the other commenter mentioning Hot Hands. They’re disposable and don’t last forever, but they’ll feel like a Godsend when you need them.
I’d suggest some kind of blanket. Space blankets don’t provide a lot of insulation but are great for windbreaking which makes them a great top layer over a normal fleece blanket.
I mentioned this in my other comment on one of your posts, but please consider including just a little bit of cash. Every person you meet will always have unique needs or wants that you can’t possibly be expected to account for. Even $5 can give them the agency to see to these specific needs on their own.