Active X Extreme Base
"Completed 34 mile run through the woods with high temps around 34 with light breeze and overcast conditions. Base layer + thicker fleece outer layer. No chaffing (including nips) after the full day. Was warm enough at the start (27F) and heated up nicely to a comfortable level for most of the day. Some chilling effects at the aid stations from sweat but they were ~5-10 min as this wasn't a race."
