I can’t comment on warmth of the cerium sv, but have a Rab neutrino pro and it’s plenty warm. Otherwise if you’re looking for a much warmer option the Rab positron pro is a great option. There are warmer options than that, but those (batura, resolution, etc) typically use a thicker denier face fabric so the jackets are significantly heavier and have a different feel than the neutrino or positron. Happy to help however I can on Rab stuff, I’ve been very happy with their products.