Carry more than feels sensible on the trailhead drive. The return is not the time to learn.
Fabric does the cooling job that sweat pays for. Cover the hours the sun owns.
Hot feet swell, damp skin tears, and the halfway boot decision ends most long days.
Cooling at stops is a scheduled job: wet the fabric, find the air, take the load off.
Heat shortens options. The route must be obvious and the clock rules agreed early.
The hot-day ten minutes extra: the things that change an outcome between first aid and recovery.