The Pertex Quantum down jacket is a true gamechanger for alpinists, offering extraordinary warmth with minimal weight. This remarkable product combines innovative TILT technology with 900FP down and an offset baffle construction, making it our warmest lightweight down jacket to date, the result of extensive research and development efforts. The Rab Men's Mythic Ultra Jacket is equipped with a helmet-compatible down-filled hood that features rear elastication, concealed internal adjustment, and a stiffened peak for enhanced protection. Its precurved and articulated sleeves ensure a superior fit and unrestricted movement. Furthermore, the offset box wall construction, incorporating TILT internal scrim on the torso, effectively minimises airflow through the jacket, reducing radiant heat loss and making it an indispensable choice for alpinists.