If you are looking for performance, Mammut's lightest insulated jacket is the ideal protection against the cold for your mountain adventures. The hydrophobic down filling from responsible sources is placed in small chambers to achieve this peak performance, insulating even in wet conditions. Under the ultra-light recycled nylon outer material, the down can expand to its full capacity for optimal insulation. Whether used as an extra warm outer layer or as compact thermal protection, the Aenergy IN Hooded Jacket is designed for all mountain athletes who want lightweight equipment without compromise.