Each to his own.....I wonder if
@rich p remembers the South Downs Way 80 in 1992? It was held on an incredibly hot weekend, temperatures peaked at about 33c. I was passed by a guy in full winter kit including a duffle jacket with his hood up. Rumour had it that he hated cold weather and would only come outside in the hottest of weathers. I seem to remember that his finishing time was 15 hrs for the 80 mile (foot) race........far better than me, I dropped out at 38 miles with dehydration, even though I was only wearing a running vest and shorts.