Keep your boot warm while driving to the mountain, I got a heated boot bag last year so I keep it plugged in while driving. I hate using mat because it gets nasty quick, especially if you are in the North East with mud, ice/water, sand, gravel and rock. I have one of those trunk trays (the size of school lunch tray), not too big, but big enough to stand in but stiff and small enough that when you pick it up, it doesn't collapse so you can just pour out the ice, water, dirt, etc at the lot. For my 6 year old, I have a milk crate for her to sit on while her boots are in the tray. I'm gonna buy traction device for my daughter and me. Icy parking lots are gonna cause a lot of problems for younger and older folks.