Optimum speed and protection for training in the mountains, the Fast Wing Hoodie is a superlight shell for racers or trainers who need that extra layer from wind or light precipitation, but refuse to carry any extra weight. While it is super light, the fabric of this jacket completely blocks wind, ensuring warmth on the fly. How light is light? This jacket packs down to the size of a small pocket. You won't need a bigger pack, this jacket fits into the tiniest nook or cranny, even your pocket. Material: Polyamide.