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Rab's Neutrino Pro Jacket is our go-to insulator for mountaineering 4,000-meter peaks, and zip it up whenever winter freezes our front doors. It's seriously warm and remarkably packable so we can take it up the highest peaks or on the coldest commutes to work. Rab used Pertex's ultra-thin, highly water-resistant Pertex Quantum Pro shell to ensure solid weather protection in extreme conditions.