Best overallThe mid-layer you wear every single evening
Rab Cirrus Insulated Jacket
Synthetic keeps insulating when it gets damp, which in a Himalayan spring matters more than the extra warmth-per-gram of down — it is noticeably less warm than a down jacket of the same weight, and that is the deal.
Skip it ifSub-zero evenings at 5,000 m as your only warm layer. This is the mid-layer under a down jacket, not a replacement for one.



