Sam wasn't much better off, really, but he'd been running and had kept up his heartrate and was warmer than she was, untying the jacket from around his waist and offering it to her, "Here, you need another layer, don't need you catching pneumonia or something."
(D'you mind if Dean and Max drop in on the thread? It works either way, because he can spot them yelling for him, or they can spot him standing around, freakishly tall thing that he is)