The Xenon X Vest is a light-weight, PrimaLoft® synthetic insulated vest, designed for extra warmth during fast-and-light alpine activities, when weight is a prime concern. Using a light-weight Pertex® Quantum fabric, the Xenon X Vest offers an excellent warm-to-weight ratio, with 60g/㎡ (Large) of the highest quality PrimaLoft® Gold insulation. Key features include a YKK front zip, 2 YKK zipped hand pockets and a slim fit for layering use.The Xenon X Vest also packs extremely small and includes an integrated stuff sack, making it easy to store away in your pack until needed. FIT NOTES (Slim Fit) Designed to be worn as a 'booster' layer providing extra warmth in cold environments. We recommend sizing up if you intend to wear multiple layers underneath.