car. If they're planning on doing the hike down through the technical sections, then they aren't ready if they think they can do it with just one car. There's no way they would miss that detail if they were also going through the permit system and prepping their gear.

If they're hiking bottom up, then it's just like any other strenuous hike, which some young guys should handle just fine. If they get cold, then they can turn around and hike back out.