Originally Posted by
MtDoraDave
That's what I wear, as well (except the toe socks).
It's been almost 3 weeks since my last section hike, and as a person who had never done more than 15 miles in one day (usually 13 or 14 max), my last day of hiking was 17 miles (mostly downhill) - the balls of both feet were sore for a couple weeks, and the left foot is still sore in the mornings.
I say this because the OP said they have never done more than 15, and plan two 20 milers back to back. Be careful. Overdoing it can put a damper on things for a while. Fatigued bodies are more likely to have trouble with normal things like ... walking without tripping.