Featherweight technical insulation and breathable fleece side panels make this zip jacket an indispensable mid-layer for fast-paced mountain ascents. Wrapped in an air-permeable Fortius Air 20 nylon shell, the core is backed by lightweight synthetic stretch padding while the sleeves remain unpadded. The fitted, articulated silhouette cinches sharply at the hem.. Weather-resistant Fortius Air 20 nylon shell with a PFAS-free DWR finish Zoned torso insulation packed with lightweight stretch synthetic padding Breathable Octa fleece side panels optimized for maximum thermal venting Compact, packable silhouette featuring a center back length of 65 cm