Compressible and lightweight, this hybrid, eco-designed thermal jacket combines TORAY® AIR STRETCH fabric and two grades of POLARTEC® to meet the intense need for thermoregulation when mountaineering. For spring/autumn and cool weather, the intelligent distribution of materials in the TRILOGY ADVANCED JKT serves up body-mapped warmth, targeted on the torso and the arms with POLARTEC® ALPHA® 40, in a DWR shell. Elsewhere, quadrille-weave POLARTEC® GRID™ takes over and swiftly wicks away surplus sweat, so you always stay in your comfort zone when wearing a harness. Its stretchiness and ergonomic fit maximize in-action sensation, with complete freedom of movement at all times. The technology is eco-mindful too: this jacket is LOW IMPACT™ certified for its frugal use of resources.