Was going to buy a Montane extreme smock to replace my buffalo special 6, but i noticed the Hydrogen extreme smock. https://www.montane.co.uk/mens-c1/montane-hydrogen-extreme-smock-p711 I cant find any reviews for the Hydrogen version, not sure if its a recently new product. "Inspired by the tried and tested Pile / PERTEX® system technology of the renowned Extreme Smock, the new Hydrogen Extreme utilises the same 2-layer softshell concept in a modernised, lighter and even more breathable package." The extreme is 1050g, hydrogen is 496g. If the Extreme is anything like the buffalo, i imagine its quite bulky for in a rucksack? So hopefully the hydrogen is a bit smaller packsize being half the weight. Wondering if anyone has any experience of it and how it compares for warmth and pack size compared to the normal extreme version?