So what's it like in regards to staying warm or keeping cool?
It depends on your level of effort, but I've always done it in two stages. Short-sleeved jersey up to the feed, long-sleeved jersey on top of that after the feed. The only time I wore a jacket was in 2007 (cold and rainy ride). If the weather's 'normal' for the time of year and there is no rain, you'll be fine with fairly minimal clothing if you don't go too slowly.
It depends on your level of effort, but I've always done it in two stages. Short-sleeved jersey up to the feed, long-sleeved jersey on top of that after the feed. The only time I wore a jacket was in 2007 (cold and rainy ride). If the weather's 'normal' for the time of year and there is no rain, you'll be fine with fairly minimal clothing if you don't go too slowly.