Our Core Jacket is the centerpiece of the GSX Adaptive Layering System, an almost impossible combination of stretch, quiet, comfort, and durability. Whether you wear it by itself, over a base layer, or under a shell, it's the perfect lightweight, all-weather jacket. Constructed of ultra-breathable, wind-resistant 97% polyester, 3% spandex double-weave fabric with a Teflon DWR finish to shed moisture and a peached interior face for superior softness and comfort. Reinforced stitching throughout ensures long-wearing durability, and mesh underarm panels allow maximum ventilation. The double-layer mock-neck collar combines with the full-length front zipper for added protection against chilly air. Two angled chest pockets with secure zipper closures provide ample storage space for your essential gear. Imported.