The Quantum uses our BodyFitZONE ™ merino wool fabric blend ; our fabric panels strategically placed elastic sponge used to conserve heat, and the Merino mesh used in other locations ensures good ventilation when you are in full effort. The adjustable hood keeps you warm and fits under your ski helmet or climbing helmet. Underarm gussets improve range of motion when planting your stick or looking for the next socket, while flat, outward facing seams avoid irritation. Finally, the chest pocket and the zippered hand pockets allow you to keep your belongings.