Mammut Eigerjoch Insulated Hybrid Jacket The Eigerjoch Insulated Hybrid from Mammut's Eiger Extreme collection is a high-performance insulated jacket. Stretchy fleece panels offer improved freedom of motion and breathability for backcountry ski touring and mountain climbing. The Eigerjoch Insulated Hybrid Jacket is made from a Pertex® Quantum Air outer material with Diamond Fuse technology offering you the ideal balance of weather protection, breathability and abrasion resistance. Providing you with warmth, Mammut have used a lining-free technology, Polartec® Alpha® Direct which offers heat retention without heat build-up, making this a warm jacket without excessive bulk. This combined with MAMMUT High Reach Technology™ the jacket allows for unrestricted freedom of movement when climbing as well as aerobic activities too. Assisting with temperature control and comfort Mammut have included inserts on the side, arms and back made from high-quality Pontetorto® Merino Tec