Mammut Eigerjoch Insulated Hybrid Gilet Insulated vest with stretch fleece and wool. The Eigerjoch IN Hybrid Vest from Mammut's Eiger Extreme collection is a performance-orientated insulated vest with stretch-fleece inserts for increased freedom of movement and breathability. The lining-free Polartec Alpha Direct insulating material offers heat retention without heat build-up. Practical: front pockets with cross-over access. The Eigerjoch Insulated Hybrid Gilet 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. To provide 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 gilet without excessive bulk. This, combined with Mammut High Reach Technology, allows for unrestricted freedom of movement when climbing as well as during aerobic activities too. Assi