Norrona's warmest mountaineering mid layer vest.This is their most flexible and warmest fleece vest designed for mountaineering, with the highest warmth-to-weight ratio in Norrona's collection. The vest features a stylish retro design, also making it perfect as a warm everyday garment for city life and travel. They use the Warm3 fabric because it is lightweight and highly insulating. Its durability and excellent flexibility ensure the vest to maintain a great look, even after extended use